FLOOD03108

• County: Delta
• Community: Delta
• Stream Name: Gunnison and Uncompahgre River
• Basin: Gunnison
• Title: Flood Hazard Information
• Date: 2/1/1980
• Prepared For: Delta County
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Floodplain Report/Masterplan

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29 February 1980

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DEPARTMENT OF THE ARMY
SACI'l"MENTO DISTRICT. CORPS OF ENGlNEERS
650 CAP,ro... ""'1,....
SACRAMENTO. C"'-'F'ORN'A ..5BI.4

~.." '0
H"~"ONO. SPKED-T

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Mr. J. William McDonald, Director
Colorado Water Conserv.tion Board
823 State Cenlennial Building
1313 Sherman Streel
Denver,Colorado 1>0203

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Dear Mr. McDonald:

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A reporl delcribing the flood hazard along the Gunn;,,,n and Uncompahgre Rivers in the
vicinity of Della, Della County, is inclosed. This '<,porl wa, prep.red in r"spon,e to your
30 March 1977 lellN and origin.1 reque'ts from the Commissioner, of Della and Montrose
Countie,. Filly copies of lhe reporlwill be furnished 10 each counly involved.
The report include,di$Cll"ion of the natule of flooding in the are., tudled,de,eriptivedatoon
the loo-year flood in that area, maps (scale 1 inch" 400 feet) showing areaS subjecl to lOO-year
flooding, profilcs showing the elevations thelO-, 50-, 100-, and 5 OO-year floods are e'pected 10
rNch,and a brief expl.nation of the methodology of deriving them agnitudeollhelOO-year
flood. A t.obie of floodfiow values together with corre,ponding water surface elevalions i'
shown", Appendi, A. Reproducible maps (,cale 1 inch" 200 leet) showing the limits of the 100.
YNr flood will be furnished to you.
Dctailedlnformat;onon the hydrologic study b.,ic to lhe report is conlained in an Aprii 1979
Office Memorondum entitled "Gunnison and Uncompahgre Rivers, Della and Montros"
Counties. Colorado, fiood Hazard Inlormation Hydrology." That memorandum ha, been
fumished 10 you, anrl copies are available for review inthisoffi ce. Aulhorily for preparing the
inclosed report was provided by Section 206 of the 1960flood Control Act, as amended. On Ihe
re<1uest of interested public agendes, the Sacramerlto Di,trid will interpret <laid in the .eporl
and provide tecnnical as>islance in Iheirapplication.
The Sacramento Disnict gratefully adnowledges the a"i'fance and cooperation of the
Curnmi"ione" of Delta and Montrose Counties; the Colorado Department of Highways; the
Colorado Water Conservation 80ard; If'u, National Weather Service; the U.S. Water and Power
Re.ources Service; the U.S. Soil Con,ervalion Servke; varlouscil~,COUnly,.td{e, and federai
asencies; and olhers who directly or indirectly aided in the preparation of the report.

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llnci
A,.tated

G'!::I!w~,~,!A
Chitf,fnglneerlngD;v;,lon

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FLOOD HAZARD INFORMATION

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GUNNISON AND UNCOMPAHGRE RIVERS
Della and Della County. Colorado

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CONTENTS

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Pagt

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INTRODUCTION .......
NATURE Of flOOD PR08LEMS
FUTURE flOODS .......

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APPENDIX

A PEAK FLOWS AND STAGES. _ . . . . . . . . . . . . . . . . . . . . . . . _ 7

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PLATES

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PLATES

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2_59
00_72

INmxMAP
FLOODED AREAS
flOOD PROfiLES

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INTRODUCTION

This report bri<,f1y COVers the findinS",of a
flood hazard information ~lUdy of a 16.5-mile
re.ch of the Gunn;son River and an-mile
reach of the Urlcompahgre Itl,'er, both in the
vicinit~ of Delta. The study reach along the
Gunn;son Ri,er eXlends from the railroad
bridge near Ihe mouth of Roubideau Creek
upstrt'am to Auslin. On {he Un(ompahgr('
River,lhe'tudyreache.tend,fromthemouth
up.tream to Olathe. The purpose 01 the report
;,{oprovjdeaba,i,forpianllinKthebesluseof

lands subject toinundalion by the lOO-year
flood. Topographic maps and channel cross
s~Clion. needed for the report were jointiy
provided by the CoioradoWalerCOn5ervation
Board, the Commissioner. of Delta and Mont-
ro.e Counties, and lhe Water and Power
Resource.Se",ice. Data on past fioods, as well
as Olher information useful in making the study,
wer~obta;nedlromlocai re,ldentsandvarious
iocal,state, and federal agencies.

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Inell

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