North Platte Water Supply Update

• File Number: 8461.250
• Description: Water Issues
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 11/8/2006
• Author: Bureau of Reclamation, Wyoming Area Office
• Title: North Platte Water Supply Update
• Water Supply Pro - Doc Type: Data

November 8, 2006 Bureau of Reclamation - Wyoming Area Office Page 1 ,
Table 1. North Platte River System Operating Plan - November Update for Water Year 2007
0rwinw4nA Tw4o1 C-tnrn Inflnw Fn, W.4uI V- 7flfl7• 'Innn Y'.if:fP-fPP.Y
Oct Nov Dec Jan Feb Mar A r Ma Jun Jul Au Se Total
Reasonable Minimum 49.2 28.5 27.6 24.9 32.0 65.2 97.5 147.2 130.7 29.0 23.3 27.9 683.0
Most Probable 49.2 412 35.7 33.8 41.7 79.0 185.5 330.5 345.5 106.2 43.4 38.0 1329.7
Reasonable Maximum 49.2 47.1 37.7 44.5 48.8 91.8 246.3 665.7 715.6 245.0 81.5 65.4 2338.6
Water Year 2006 34.1 35.4 32.1 40.5 33.8 65.6 167.7 251.2 145.1 45.6 24.5 31.3 906.9
Average 1977-2006 49.9 47.2 39.0 42.2 47.9 86.5 163.2 326.8 326.9 111.7 45.0 39.3 1325.4
Prniee4orl Pimrncav Raswrvnir Aufflnw fnr Wafar Yaar 2007c 1000 x acre-feet
Oct Nov Dec Jan Feb Mar A r Ma Jun Jul Au Se Total
Reasonable Minimum 0.1 0.2 0.3 0.4 0.3 0.3 0.4 11.7 93.0 305.5 257.8 48.9 718.9
Most Probable 0.1 0.2 0.3 0.4 0.3 0.3 19.8 171.0 172.0 308.0 313.0 179.0 1164.4
Reasonable Maximum 0.1 0.2 0.3 0.4 0.3 0.3 46.0 139.0 127.0 311.0 303.0 187.0 1114.6
Water Year 2006 0.1 0.1 0.1 0.4 0.4 0.5 26.9 162.2 120.1 306.9 282.2 15.4 915.3
Average 1977-2006 10.5 2.7 0.8 0.5 1.8 17.0 54.3 127.7 170.3 324.7 286.4 143.9 1140.6
Drninrfnrl Tn4nl Rvc4nm Fnrl_nf_Mnn4h R4nr2na* fnr Wa4ar Vaar 9fl07- 1(100 x acrP.-fPPt
Oct Nov Dec Jan Feb Mar A r Ma Jun Jul Au Se
Reasonable Minimum 852.6 878.9 905.2 928.2 957.4 1017.6 1105.9 1217.9 1221.4 908.0 644.7 609.2
Most Probable 852.6 891.6 924.9 955.9 994.8 1068.6 1225.1 1359.7 1497.6 1255.5 954.0 796.6
Reasonable Maximum 852.6 897.5 933.9 975.6 1021.6 1108.1 1298.8 1799.0 2344.3 2227.9 1964.0 1817.9
Water Year 2006 1038.7 1069.3 1099.0 1137.1 1167.5 1227.6 1341.5 1398.1 1382.2 1085.3 800.6 805.9
Average 1977-2006 1496.3 1537.3 1572.8 1611.2 1653.5 1715.9 1811.5 1980.3 2094.9 1836.7 1558.4 1434.3
* includes Kortes Reservoir Content of 4.7 kaf and Gray Reef Reservoir Content of 1.5 kaf
# Actual data for Minimum, Probable, & Maximum Plans used in the October Column
NORTH PLATTE RIVER BASIN INFLOW
The October inflows were below average for all reservoirs in the North Platte Basin except for
Seminoe Reservoir which was above average. Pathfinder Reservoir recorded the 4th lowest
October inflow in the last 30 years. Glendo Reservoir recorded the 3rd lowest October inflow
in the last 30 years. Guernsey Reservoir tied for the 4th lowest October inflow in the last 30 years.
iinnn.-rmri
October
Inflow October
Historical Inflow Accumulated Inflow
October -
Reservoir W. Yr.
2007 30 Yr.
Avg. 5 % of
Av . t00 Yr.
6 W. Yr.
2 005 W. Yr.
2004 W. Yr.
2007 30 Yr.
Avg. 5 % of
Avg.
Seminoe 41.0 28.0 146 23.5 39.6 12.9 41.0 28.0 146
Path£nder 1•' 1.9 6.1 31 4.5 4.0 3.0 1.9 6.1 31
Glendo ' 4.8 13.5 36 4.7 4.6 4.8 4.8 13.5 36
Guernse ' 1.5 2.3 65 1.4 1.2 1.7 1.5 2.3 65
n is assumea mat mere is no gam ceiwcen semmce ana Kortes uams.
2 River gain belween Kortes and Pathfinder Dams.
3 River gain between Pathfinder and Glendo Dams.
` River gain betwcen Glendo and Guemsey Dams.
5 30 year average. (1977-2006)
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