Table Of ContentPrepared in cooperation with the SCIENTIFIC INVESTIGATIONS MAP 2868
MONTANA DEPARTMENT OF TRANSPORTATION,
(Sheet 1 of 5)
U.S. DEPARTMENT OF THE INTERIOR MONTANA DEPARTMENT OF NATURAL RESOURCES AND CONSERVATION,
Parrett and others, 2005, Water-surface elevation data and flood and
U.S. GEOLOGICAL SURVEY PARK CONSERVATION DISTRICT, and the U.S. ARMY CORPS OF ENGINEERS
floodway boundaries for the upper Yellowstone River, Montana
Water-Surface Elevation Data and Carter Bridge four ufonugra guendg a greeadc rheeasc h beest wbeetewne eMn oMl oHl eHrreornro nC rCereeke k a nandd T Toomm MMiinneerr 4,700 Table 2. Drainage-area and flood-frequency data for selected stream reaches on the upper Yellowstone River, Montana. A A'
Creek, between Tom Miner Creek and Big Creek, between Big Creek
54 and Mill Creek, and between Mill Creek and Trail Creek. Estimates Cross Peak discharge (cubic feet per second) for indicated recurrence
Flood and Floodway Boundaries 54.5 were based on a linear interpolation between logarithms of flood 4,695 Drainage section interval, in years
Stream reach area, in numbers
56.5 discharges at the two gaged sites using logarithms of drainage area as
for the Upper Yellowstone River, square miles (sheets
the basis for interpolation (Parrett and Johnson, 2004). Drainage-area 2 10 50 100 500
57 1-5)
information and flood-frequency data for the Yellowstone River 4,690
Montana throughout the study area are summarized in table 2. Gardiner to Mol Heron Creek 12,623 147-160 17,500 25,000 30,200 32,100 36,200 71.5
8)
8
NAVD 4,685 Beatnwde eTno mM oMl iHneerr oCnr eCerkeek 2,750 129-145 17,900 25,500 31,000 33,000 37,400
57.5 Hydraulic Analysis ET ( 100-year flood
By Charles Parrett, Stephen R. Holnbeck, and Katherine J. Chase QX0171 A one-dimensional, hydraulic-flow model was used to determine N, IN FE Beatnwde eBni gT Comre eMkiner Creek 2,900 114-130 18,400 26,200 31,900 34,000 38,900
O 4,680 71.8
water-surface elevations for selected flood discharges where channel ATI Between Big Creek and Mill 3,060 87-113 18,900 26,800 32,800 35,100 40,300
V
Introduction cross sections were surveyed. The hydraulic flow model developed by ELE Creek
the U.S. Army Corps of Engineers (USACE), HEC-RAS, version 3.0,
4,675 Between Mill Creek and Trail 3,400 62.5-86 19,900 28,100 34,700 37,300 43,500
The upper Yellowstone River in south-central Montana is an QX0170 57.8 (2001a,b,c), requires channel, bridge, and flood-plain geometry data Creek
and channel and flood-plain roughness characteristics (Manning's n Ground surface
important source of irrigation water and a blue-ribbon trout stream. In Trail Creek to Carter Bridge 23,551 54-62 20,300 28,700 35,500 38,300 44,800
values) to calculate flood elevations. Channel and bridge geometries
addition, an increasing number of homes are being built in the scenic were surveyed at 139 river cross sections from Gardiner to just 4,670 1Drainage area and flood discharges are the same as those for gaging station at Corwin Springs (06191500).
upper Yellowstone River valley. In 1996, severe flooding caused Data from Parrett and Johnson (2004).
downstream from Carter Bridge near Livingston. Flood-plain geometry
substantial channel and bank erosion, particularly just upstream from 89 2Drainage area and flood discharges are the same as those for gaging station near Livingston (06192500).
data were obtained from digital topographic maps. Roughness
Livingston (fig. 1). Following the flood, numerous projects were 4,665 Data from Parrett and Johnson (2004).
57.9 characteristics, which were determined in the field at the time of -200 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800
completed to stabilize the banks. In 1997, a severe flood again caused channel surveys, ranged from 0.025 to 0.065 for the main channel and DISTANCE FROM LEFT BANK LOOKING DOWNSTREAM, IN FEET
channel and bank erosion. Although previously constructed
from 0.030 to 0.150 for the flood plain. High-water marks (such as Figure 2. Cross section 71, which is typical of a location in the lower study reach with multiple
stabilization projects decreased erosion in some locations, they were
seed lines and flood debris) from either the 1996 or 1997 floods were channels and a wide flood plain.
thought to have contributed to increased erosion in 1997 at upstream or
surveyed at cross sections wherever they could be found. These high-
downstream locations, and future bank-stabilization projects, therefore,
water marks, though of variable reliability, were used to help calibrate 4,865
became controversial. To study the effects of bank stabilization on the
QX0553 the hydraulic model. At six locations, additional surveyed cross-section 72
dynamic upper Yellowstone River, a task force was appointed by the
58 data were available from the U.S. Department of Agriculture, Natural
58.25
Governor of Montana. The Upper Yellowstone River Task Force Resources Conservation Service (NRCS), and were included in this 4,860 C r e e k
initiated a cumulative-effects study of the upper Yellowstone River.
analysis (Ralph Bergantine, Natural Resources Conservation Service,
The main objective of the cumulative-effects study was to gather 58.5 written commun., 2000). Interpolated cross-section data were used at 4,855 73
information from a wide range of scientific investigations in the basin
12 more locations where the hydraulic-model results indicated that
and to use the scientific information as a basis for assessing the long-
additional channel and flood-plain geometry were required. Thus, a
4,850
term, cumulative effects of proposed streambank-stabilization projects. total of 157 cross sections were used for the determination of water- 88)
The U.S. Geological Survey (USGS), in cooperation with Montana surface elevations in the entire study area. The total number of cross AVD ald
CDoenpsaertrmvaetniotsn o(fM TDrNanRsCpo),r taPtaiorkn C(MonDseTr)v aatniodn NDaitsutrraicl t,R aensodu rtchees Ua.nSd. seeaccthi oonfs athlseo sienvcelund ebdri dsegcetsi oinns tahte t hset uudpys traeraema. a nTdh doosew n1s4t rebarimdg fea ccerso ossf N FEET (N 4,845 cDon
Army Corps of Engineers (USACE), investigated the hydraulic 58.9 sections are not shown on the flood-plain maps (segments 1-8) for ON, I 4,840 M
characteristics of the upper Yellowstone River as part of the TI Mallards
clarity. A
V 100-year flood
cumulative-effects study. The investigation of hydraulic characteristics R Field surveys and elevations are referenced to U.S. Geodetic ELE 4,835 Rest
had two major objectives: (1) determination of flood and floodway E Campground
V Survey or U.S. Coast and Geodetic Survey bench marks along the
boundaries for parts of the upper Yellowstone River and (2) simulation RI upper Yellowstone River which are shown on the flood-plain maps.
of sediment transport for a part of the upper Yellowstone River. 4,830
Information about the bench marks can be obtained from the National Ground surface
This report presents water-surface elevation data required to meet
Geodetic Survey at http://www.ngs.noaa.gov (accessed March 16,
objective 1 and shows the mapped flood and floodway boundaries. The
2004). 4,825
mapped flood boundaries show the extent of flooding from flood QX0172
Data from about 53 surveyed cross sections from various sources
discharges having recurrence intervals of 500 and 100 years. The
were being used for hydraulic analyses by the USACE downstream
4,820
mapped floodway boundaries show the area within the boundaries of 0 100 200 300 400 500 600 700 800 900 1,000
58.95 from Carter Bridge. Calculations by the hydraulic model proceed in an
the 100-year flood discharge that is reserved for the passage of flood upstream direction; consequently, cross sections used for this study DISTANCE FROM LEFT BANK LOOKING DOWNSTREAM, IN FEET 74
flows under Montana Administrative Rule 36.15.502 (1995). The Figure 3. Cross section 90, which is typical of a location in the lower study reach where the channel
were numbered in an upstream direction starting with cross section 54
hydrologic analysis is based on recorded annual-peak discharge data is incised and the flood plain is narrow.
just below Carter Bridge (segment 1, sheet 1). Graphs showing sample
from 1890 through 1998 for two USGS streamflow-gaging stations
59 cross sections (figs. 2-4) are for a channel reach with multiple channels
(stations 06191500 and 06192500, fig. 1). The hydraulic analysis is
and a wide 100-year flood plain (cross section 71, fig. 2), a channel
based on channel- and bridge-geometry data collected between 1999- 5,105
reach with an incised channel and narrow 100-year flood plain (cross SEGMENT 2
EXPLANATION
2001. The hydraulic analysis and resulting flood mapping were more
section 90, fig. 3), and a channel reach with a typical bridge and pier
detailed for the lower study reach from Carter Bridge upstream to Point (cross section 149, fig. 4). Data for all cross sections used in the study AREA INUNDATED BY THE 100-YEAR FLOOD--Includes
of Rocks bridge than for the upper study reach from Point of Rocks are available in files at the USGS Montana District Office in Helena, 5,100 floodway where floodway data were available
Bridge structure
bridge upstream to Gardiner.
60 Mont.
AREA INUNDATED BY THE 500-YEAR FLOOD--Includes
Two different levels of hydraulic analysis were used for the study,
100-year flood the area inundated by the 100-year flood
depending upon the accuracy and resolution of the digitized aerial-
E 5,095
CANADA ON dphigoittoagl ratopphoicg rbapashei c udseadta ,f oarn dfl otohde- pnluaimn bmera popfi nagn,d thsep aacvinaigl abbieltiwtye eonf VD 88) FLOODWAY
M OMisso uNri T A N A River NORTH DAKOTA YELLOWST SEGMENT 1 sdjouuifgs rtv i tRbeayelo elcoodkrw tshc Cho bapanrhritnodeetgrol e Bg crr rai(odpcsghrsoes s s(wsec cresotreiseocs nta issove.an ci tlT1iao2bhn4le e) 5 .b4f oe ) rsu tt pDhrseeitg srleoiotalawumlt ei troto onps tjouu(g1dsr:tya8 a p,rb0heo0aicv0c eh s Pmfcroaaoilpmnes)t ATION, IN FEET (NA 5,090 Pier 75 76.5 S C fTRloROwES AaSMr eSa ECsC EdTNuIrTOinENgR tALhINeN D1E 0-N-0CU-yoMenaBnreE fcRltoso adp dpirsocxhiamrgaete centroids of
IDAHO Map areYaellowstone River SOUTH DAKOTA ewmmleiaotvprheap -tiid4noe-gnft asts )itl acemnodedn eahttoryidundsrgr a aFuilnsleitodce e rwravanaelalr seEly masaivnesar digwl eaainbnsclt eyep rfeMmorfriao tnttrheamingsete dmre eeafloencvrht a.At th igoAisen cn lccoodywra d(teaFirn Egs(Mltsyup,Ad oya)t ELEV 5,085 Ground surface QX0555 QX0174 U G.SE. OGDEEOTDICET SIUC RSVUERYV BEYEN ACNHD MUA.SR. KC OANADST N AUNMDB ER
WYOMING 61
reach. The more-detailed hydraulic analysis included determination of 5,080
Yellowstone
National water-surface elevations at cross sections for the 2-, 10-, 50-, 100-,
Park
and 500-year flood discharges, determination of a floodway, and
110 O 45' 110 O 30' determination of the areas that would be inundated by the 100-year and
R.6E. R.7E. R.8E. R.9E. R.10E. 5,075
Cr Ferry 500-year flood discharges. -50 0 50 100 150 200 250 300 350
QX0173 The aerial-photographic base map available for the upper study DISTANCE FROM LEFT BANK LOOKING DOWNSTREAM, IN FEET
T.1S.
Bridger Cr reach just upstream from the Point of Rocks bridge (cross section 124) Figure 4. Cross section 149, which is typical of a location in the upper study reach with a bridge and pier.
Cr upstream to Gardiner (cross section 160) had less resolution (1:12,000
Livingston scale) than the base map for the lower study reach. Also, the only
61.5
T.2S. Jackson U.S. Geological Survey available digital topographic data for this upper study reach were USGS
B streamflow-gaging station (06192500) 1:24,000 digital-elevation-model (DEM) data with 20-ft contour
ear intervals. Finally, because of the lower-resolution aerial photography 76
61.8
Carter and less-detailed topographic information, fewer cross-sections were
Cr Bridge 89 surveyed in this upper study reach than in the lower study reach.
T.3S. CO Trail PCirneee k River Deep Cr CPooinnste oqfu eRnotlcyk,s ab rliedsgse-d teot aGilaerdd ihnyedr.r a Tulhice laensasl-ydseitsa iwleads a pnearlyfosrism iendc lfurdoemd 40' R.9E. 110 o 35' 89 V E R
CO Bridge Pine Creek only determination of the 100-year water-surface elevation at cross R I
45T O. 43S0'. GALLATIN PARK Eightmile Cr Creek Yellowstone PineCreek 62 u1ssdtep0iuscp0dcte-ihyyora enr sasgrtr eue aa.dfn cly odAh o .r tdefh l aeWodc oihaasd rtcweethhraaa-asysrn gu t wherif anaaat sc rt weehn eooc tuoe lllodnedwesv itbaedeterrei m rosienntidunsu d ent dyoda afnbrotedeera d clmt ehhbsai ysspb plerteehecsldaesiu a-1d bsle0elie 0tma o-wiiyflt eesittd ahhor,ei fnu f l lp eotpthsohesidesr- 1 U M PREAPIPXVE ESPRERL YG ASEMTNLUELANDOTYTWI NAOSRTUNEOMANBEE R--Red4T5. 3o 3S5.' 1 S T O N E 4,590 LOWER STUDY REACH
segment number represents W (Map segment 1)
detailed base map and topography and few cross-section data. segments shown on this sheet L O
T.5S. L
Emigrant Pray Elbow Yankee Jim Canyon is located within the less-detailed, upper study A A' MATCHLINE--Line separating 30' A A' Y E 4,580
Mill Cr arenadc hc r(ossesg mseecntito 6n)s. c oSutrleda mnoftl obwe issa fveelyry stuurrvbeuyleedn.t iTn htuhsis, wstaeteepr -scuarnfyaocne map segments 1-8 T.4S.
Chico N elevations were not determined between cross sections 131 and 135. 2
4,570
T.6S. Big Cr PRbrooidicngktse of River Cr 62.5 Nweidveerr tthhealne stsh,e fclohoandn beol ubnedcaaurisees oifn ththee s tceaenpy coann yaroen cwoanlslsid.ered to be no 45' R.8E. B NAVD 88) CBarirdtegre 59
T (
45T O. 71S5.' TRoomcMkiMneCirnCrrer Yellowstone Y J a CinmakeneySo ixnmile Cr WestFork QX0174 sWurfaacTteae berl-eleS v3au t(irsofhnae edcta te2a) Efporlre estehvneat s2 t-ti,h oe1 n0s-t ,r De5a0am-,tb ae1d0-0 -a,n adn dca l5c0u0la-yteeda r wfaloteord- 110 o 55' R.7E. 50'T.52S5'. 3 B' CLaomchp gLreovuennd 77.5 77 76.5 ELEVATION, IN FEE 44,,555600 57.8 57.9 58.25 58.5 Stream5b8e.9d5
C 57.5 58
discharges at each cross section in the more-detailed, lower study reach 20' 58.9
57
T.8S. Mol CHr eron CorwUi.nS S. Gpreinoglsogical Survey f2r)o mpr eCsaernttesr Bthrei dcgael cuuplsattreeda mw taote Pr-osiunrtf aocfe R eolcekvsa tbiornidsg efo. r Ttahbel e1 40 0(-syheeaert 4 C' 4,540 56.5 56U
streamflow-gaging station (06191500)
flood discharge at each cross section in the less-detailed, upper study T.6S.
YELLOWSTONE Jardine 63 reach from Point of Rocks bridge upstream to Gardiner. Cumulative 54 54.5 56D
T.9S. NATIONAL
PARK Gardiner distances for all cross sections upstream from cross section 54 (most D N 4,5300 1 2 3 4 5 6 7 8 9 10
downstream cross section) used in the hydraulic analysis are presented 15' DISTANCE, IN THOUSANDS OF FEET UPSTREAM FROM CROSS SECTION 54
Base modified from U.S. Geological Survey 0 5 10 MILES in both tables. The water-surface elevation data can be used with the D'
State base map, 1965, 1:500,000. North
American Vertical Datum of 1927 (NAD 27) 0 5 10 KILOMETERS distance data to construct profiles of flood elevations throughout the 5 4,695
EXPLANATION study area (except for Yankee Jim Canyon). Flood profiles are useful T.7S. E LOWER STUDY REACH
UPPER YELLOWSTONE RIVER STUDY AREA for estimating flood elevations at selected locations between cross E' (Map segment 1)
sections. Three representative flood-profile graphs are shown in figure
LOWER STUDY REACH, more-detailed 4,685 Pine
5. This hydraulic analysis was based on unobstructed flow. Water- 6 Creek
UPPER STUDY REACH, less-detailed k 10' 78
e surface elevations presented in tables 3 and 4 and in the representative Bridge
e
r profiles (fig. 5) are valid only if hydraulic structures remain clear of F'
Figure 1. Location of the upper Yellowstone River study area, Montana. C
debris and do not fail. The water-surface elevations also are valid only 4,675
T.8S. F 88)
for channel and flood-plain conditions at the time of the surveys. D
V
63.5 7 T (NA
Study Area Description 45 o 05' N FEE 4,665 71
The Yellowstone River originates in Wyoming, in and near the ail Flood Boundaries G G' VATION, I Streambed 67 70.5
southern part of Yellowstone National Park. The river enters Montana Tr The flood boundaries along the river define areas that would be T.9S. 8 ELE 4,655 66.5 67.7 69.5 70
near the town of Gardiner and flows north and east across 500 mi of inundated by the 100- and 500-year flood discharges. The flood 68D 69
63.75
boundaries were delineated using water-surface elevations determined
southern Montana, joining the Missouri River just inside North Dakota. 68U 68.5
66.4
The study area consists of the Yellowstone River flood plain from at each cross section. Between cross sections, the flood-elevation 66 68.3
64 profiles were used to determine water-surface elevations, which in turn DIAGRAM SHOWING RELATIVE POSITION OF MAP SEGMENTS 4,645
Gardiner, near the boundary of Yellowstone National Park, to Carter
AND MATCHLINES ALONG THE UPPER YELLOWSTONE RIVER 66.3
were used to interpolate flood boundaries based on mapped elevation
Bridge, about 56 river mi downstream near Livingston (fig. 1). The 64.25
contours. RiverCAD (Boss International, 2000) was used to interpolate
topography through this reach varies from steep, winding mountain 64.5
canyons to a broad alluvial valley bordered by high mountains. and draw flood boundaries between cross sections. 4,635
34 35 36 37 38 39 40 41 42 43 44
Flood boundaries for both the 100- and 500-year flood discharges
Estimated elevations in the drainage basin range from 12,160 ft at the
DISTANCE, IN THOUSANDS OF FEET UPSTREAM FROM CROSS SECTION 54
are shown for the lower, more-detailed study reach (map segments 1
headwaters in Yellowstone National Park to 4,480 ft at Livingston.
through 4), while flood boundaries for just the 100-year flood discharge 79.5
Land uses in the study area include irrigated hay production, 5,250
are shown for the upper, less-detailed study reach (map segments 5
livestock grazing, and residential development. Cottonwood, western 79 UPPER STUDY REACH
through 8). In both study reaches, small areas within the flood
snowberry, woods rose, red-osier dogwood, and various native grasses (Map segments 5, 6, 7, and 8) 160
boundaries for the 100-year flood discharges might be above the water-
and sedges grow along the stream banks (U.S. Department of 5,200
159
surface elevation, but cannot be shown because of the limitations of the
Agriculture, Natural Resources Conservation Service, 2001).
map scale or the lack of sufficiently detailed topographic data. 158
The climate is semiarid with cold winters and warm summers.
Based on climatic data for the period of record, 1971-2000, average 65 Likewise, small areas within the flood boundaries for the 500-year 5,150 157
Corwin
6mw7io.t3nh t ahoFbly oi untte Jm5u3pl yep.r ea rAtcuverenertsa ogafet t hLainisvn iaunmaglos tpuornnet c friaaplniltgianetgi o finrno imAn p L2ri5ilv. 6itnh grooFsut oginnh iJJsau n1lyu5.a .7 rMy i nato.y, D e e p C r e e k tfhloeo wd adtiesrc-shuarrfgaec esh eolwevna tiino nth. e more-detailed study reach might be above NAVD 88) 5,100 Yankee Jim Canyon Sbrpirdignegs 151556
typically is the wettest month, with an average of 2.8 in. of ET ( (no water-surface or 154
E
precipitation, whereas February typically is the driest month, with an Floodway Boundaries N F streambed data) 151 153
80 N, I 150 152
ia2nv0ce0lru1ad,Mg epea . Mjo1of4ro , 0l 2t.r5H1i b)ei.unro.t an(r NiCeasrt eioeonkf a, ltT hOoem cYe aMenlliiocn wearsn tCdo rnAeeet mkR,o iBsvpeighr eCriinrc e Aethkde, m Msitniulilds tyCra rtaeioreekna,, dfliovoiddTewdha eyi n,a twroe hati wcwhoi tihps iornre tstiheorenv sbe dofo ufrno drf latohroieed sp- paolsfas iatnhg eem 1oa0fn 0fa-lgoyeoemadr e fnflolto wopsdu, r idpniocsscleuhsda.e rg sT et hhiees ELEVATIO 55,,000500 TMboriimndeg re 135136 138 140141134421 141547 148148.5141941U94D9.5
and Trail Creek (fig. 1). These are perennial streams, and most runoff 65.5 channel and some adjoining flood plain. The flood fringe, which is 137 139
allowed to be developed with structures elevated on suitable fill QX0557 Streambed 131
results from snowmelt or snowmelt augmented by rain in May or June. 130
material, includes the outer parts of the area inundated by a 100-year
4,950 129
flood discharge. The width of the floodway under Montana 128.5
126 127
Methods Of Analysis Administrative Rule 36.15.502 (1995) is determined by hydraulic 124.5 125 125.5 126.5 127.5 128D 128U
calculation such that the water-surface elevation of the 100-year flood
4,900
discharge is increased by no more than 0.5 ft by complete filling 180 200 220 240 260 280 300 320
(encroachment) of the flood fringe. Montana Administrative Rule 89 DISTANCE, IN THOUSANDS OF FEET UPSTREAM FROM CROSS SECTION 54
R
Hydrologic Analysis 36.15.502 (1995) further requires that flood-plain areas where flow E EXPLANATION
depths or flow velocities for the 100-year flood discharge exceed 3 ft or V FLOOD PROFILE 1996 or 1997 HIGHWATER MARK
I
3 ft/s, respectively, need to be included in the floodway. Figure 6 R 500-year flood discharge
Data for the largest recorded annual peak discharges from 1890 139 LOCATION OF CROSS SECTION
(sheet 2) shows a hypothetical cross section with a floodway and 100-year flood discharge AND NUMBER
tRhirvoeurg wh it2h0in0 1t haet sttwudoy satrreeaa marfelo swu-mgmagairnigz esdt ainti otnabs leo n1 . t hTeh eY e1l9lo9w7 sptoeanke water-surface elevations for the 100-year flood discharge with and B 81 50-year flood discharge CBarirdtegre BRIDGE AND NAME--Symbol
without encroachment in the flood fringe. 10-year flood discharge reflects relative bridge size
discharge, the largest recorded at both stations, was nearly equivalent to
The HEC-RAS hydraulic model was used to calculate floodway 2-year flood discharge
the 100-year flood estimate at both sites. The 1996 peak discharge was E
boundaries by incrementally encroaching on the 100-year flooded area N
identical to the 1997 peak discharge at Corwin Springs and almost as
66 from each side of each cross section and re-running the hydraulic O Figure 5. Streambed and flood profiles for selected reaches of the upper Yellowstone River, Montana.
large as the 1997 peak discharge near Livingston. Other notable large ST
model until calculated water-surface elevations for the 100-year flood W
floods occurred in 1918 and 1974 (table 1).
discharge increased by a maximum of 0.5 ft at all sections (U.S. Army O
Flood-frequency data (annual peak discharges having selected L
recurrence intervals) were determined by application of the log Pearson V E R Corps of Engineers, 2001c). The water-surface elevation for the YEL
Type III probability distribution to the recorded annual peak discharges R I 100-year flood discharge at many cross sections was not increased by
the floodway-boundary calculations because the floodway width was
at the mainstem streamflow-gaging stations at Corwin Springs and near
expanded to include areas of high depths and velocities. At a few cross
Livingston for their periods of record through 1998 (U.S. Geological E
N sections near bridges, the calculated water-surface elevation for the
Survey, 2002). Flood-frequency data also are commonly referred to as O
T 100-year flood discharge with a floodway was less than that without a
T-year floods, where T is the recurrence interval for a particular annual S 66.3
W delineated floodway. The calculated lower water-surface elevation
peak discharge (flood). Flood-frequency data for the gaging station at
O probably is the result of more efficient hydraulic transitions between
Corwin Springs were considered applicable to the reach from Gardiner L 66.4
L adjacent cross sections with a delineated floodway than without. For 82 U.S. Geological Survey, Reston, Virginia: 2005
to the mouth of Mol Heron Creek. Flood-frequency data for the gaging E 83.5
Y those few sections with lower calculated water-surface elevations with a For sale by U.S. Geological Survey, Information Services
station near Livingston were considered applicable to the reach from 66.5
floodway, the lower elevations were raised to match those without a Box 25286, Denver Federal Center
the mouth of Trail Creek to Carter Bridge, where the gage near
floodway. Denver, CO 80225-0286
Livingston is located (fig. 1). Flood-frequency data were estimated for
Data for floodway widths and changes in water-surface elevations
67 for the 100-year flood discharge as a result of floodway delineation at 84.5 For additional information write to:
all sections in the lower, more-detailed study reach are shown in M
District Chief
Table 1. Largest recorded annual peak discharges for table 5 (sheet 3). Floodway boundaries are shown together with 100- 85ill U.S. Geological Survey
the Yellowstone River at Corwin Springs and near 67.7 Pine Creek Bridge and 500-year flood boundaries (segments 1 through 4).
C 83 3162 Bozeman Avenue
Livingston, Montana, 1890-2001. 68.3 re Helena, MT 59601
e
k
Discharge of Yellowstone River ,
in cubic feet per second 68.5 For more information about the USGS and its products:
Date o
At Corwin Springs Near Livingston 69 70.5 ver Telephone: 1-888-ASK-USGS
f World Wide Web: http://www.usgs.gov/
(06191500), fig.1 (06192500), fig.1 69.5 Pine 85 low
06/06/1997 32,200 38,000 Any use of trade, product, or firm names in this publication is for descriptive
06/10/1996 32,200 37,100 70 71 Creek purposes only and does not imply endorsement by the U.S. Government.
Digital-orthophotographic base from Surdex Corporation, 1:8,000, 2002
06/17/1974 30,900 36,300 SCALE 1:12,000 (segments 1-4); and the U.S. Department of Agriculture-Forest Service, Suggested citation:
06/14/1918 32,000 No record 0 0.25 0.50 0.75 1 MILE B' 1:12,000, 2002 (segments 5-8) for the U.S. Army Corps of Engineers. Parrett, Charles, Holnbeck, S.R., and Chase, K.J., 2005, Water-surface elevation data and
Digitized aerial-photographic base by MAP, Inc., April 1999.
06/13/1911 25,800 No record flood and floodway boundaries for the upper Yellowstone River, Montana: U.S. Geological
0 0.25 0.50 0.75 1 KILOMETER Survey Scientific Investigations Map 2868, 5 sheets.
06/11/1902 No recor d 30,100
A A'
WATER-SURFACE ELEVATION DATA AND FLOOD AND FLOODWAY BOUNDARIES FOR THE UPPER YELLOWSTONE RIVER, MONTANA
By
Charles Parrett, Stephen R. Holnbeck, and Katherine J. Chase
