WSP11426

• File Number: 8230.200.20
• Description: UCRBRIP
• Basin: Colorado Mainstem
• Date: 1/1/1995
• Author: Leonard Rice
• Title: Colorado River Basin Physical Water Availability Study - Final Report
• Water Supply Pro - Doc Type: Publication

Table of Contents

I INTRODUCTION ................................................ 1
1.1 Background .............................................. 1
1.2 Study Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Organization of Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., 4

II SELECfION OF STIJDY PERIOD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7

II.1 Methodology ............................................. 7
II.L1 Gaging Stations Investigated . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7
II.L2 Gage Record Modifications. . . . . . . . . . . . . . . . . . . . . . . . . . . ., 8

II.L3 CRSS Flows. . . . . . . '.' . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., 8
II.2 Results ................................................. 10
11.2.1 Comparison of Modified Gage Flows to CRSS Flows .......... 10
II.2.2 Monthly Correlations .... . . . . . . " . . . . . . . . . . . . . . . . . . . ., 11
II.2.3 Study Period Statistics ................................ 11
1l.2.4 Comparison of Proposed Study Period to Long Term Period. . . . .. 13
II.2.5 Comparison of Proposed Study Period to USFWS Study Periods .. 14
II.3 Recommended Study Period .................................. 15

III YAMPA RIVER BASIN. . . . . . . . . . . . . . . . . . . . . . . . : . .. . . . . . . . . . . . . . .. 16

IIL1 Methodology ............................................ 16
m.L1 Streamflow Records Collected ..... . . . . . . . . . . . . . . . . . . . .. 16
IILL2 Estimation of Missing Records. . . . . . . . . . . . . . . . . . . . . . . . .. 17
III.1.3 Adjusted Gage Flows ................................ 17

IIL1.3.a Reservoirs.................................. 18
III.l.3.b Transbasin Diversions ......................... 19
III.l.3.c New Power Company Depletions. . . . . . . . . . . . . . . . .. 19
. IIl.1.3.d Gage Adjustment Tables. . . . . . . . . . . . . . . . . . . . . . .. 20

III.2 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 25

IV LITTLE SNAKE RIVER BASIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 28

IV.1 Methodology ................................................. 28
IV.1.1 Streamflow Records Collected . . . . . . . . . . . . . . . . . . . . . . . . .. 28
IV.l.2 Estimation of Missing Records ......................... 29
IV.l.3 Adjusted Gage Flows ................................ 29
IV.1A Estimated Current and Future Wyoming Depletions of Little Snake

River. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 31
IV.l.4.a Current Little Snake Depletions in Wyoming ......... 31
IV.l.4.b Future Little Snake Depletions in Wyoming ... . . . . . .. 31
IV.15 Wyoming's Contribution to Uttle Snake River Flows at Lily .... 32

IV.2 Results................................................. 33