Daily Accounting Calculations By Year

Season: Mar 1, 2026 - Oct 31, 2026

Unit Abbreviations: ac-ft, acre-feet; cfs, cubic feet per second; eod, end of day; eopd, end of previous day; °F, degrees Fahrenheit; in., inches

Data are provisional and subject to revision until they have been thoroughly reviewed and received final approval.

The Water Tracker's tracking equations were jointly developed by the Walker River Paiute Tribe, Bureau of Indian Affairs, and National Fish and Wildlife Foundation, with technical support from USGS in January 2014. Starting in the 2023 irrigation season, amendments were made to the original protocols by incorporating streamflow data from USGS 10301600 Walker River Above Weber Reservoir.

Program Water

All values in cfs unless specified. Roll over type of water (such as Little Dam Gage) to see abbreviation. Negative net loss is a gain; positive net loss is a loss. Decree priority is set by the Federal Water Master and reported by the Walker River Irrigation District.

Date Decree
Priority (Main)
A. At Wabuska B. Weber Reservoir C. Little Dam D. Mouth of Walker Lake
Decree
Demand
Decree WRID
Storage
Demand
WRID
Storage
Temp
Decree
Demand
Temp
Decree
Total
Program
Water
Inflow Storage
ac-ft
Outflow Net Loss Flow Decree
Flow
WRID
Storage
Temp
Decree
Flow
Flow
04/16/2026 1879 4.5 4.5 0.0 0.0 0.0 0.0 4.5 4.4 8.76 4.3 0.1 3.0 3.2 0.0 0.0 3.2
04/15/2026 1879 4.5 4.5 0.0 0.0 0.0 0.0 4.5 4.3 8.56 4.8 0.2 3.2 2.2 0.0 0.0 2.2
04/14/2026 1879 4.5 4.5 0.0 0.0 0.0 0.0 4.5 4.8 9.45 3.2 -0.3 2.2 2.7 0.0 0.0 2.7
04/13/2026 1879 4.0 4.0 0.0 0.0 0.0 0.0 4.0 3.2 6.26 3.8 0.8 2.7 2.9 0.0 0.0 2.9
04/12/2026 1875 4.0 4.0 0.0 0.0 0.0 0.0 4.0 3.8 7.51 4.1 0.2 2.9 2.8 0.0 0.0 2.8
04/11/2026 1875 4.0 4.0 0.0 0.0 0.0 0.0 4.0 4.1 8.09 4.2 -0.1 2.8 2.7 0.0 0.0 2.7
04/10/2026 1875 4.0 4.0 0.0 0.0 0.0 0.0 4.0 4.2 8.27 4.0 -0.2 2.7 2.4 0.0 0.0 2.4
A. At Wabuska

All values in cfs. Roll over type of water (such as Flow) to see abbreviation.

Date Flow
04/16/2026 82.7
04/15/2026 88.1
04/14/2026 90.0
04/13/2026 106.0
04/12/2026 75.6
04/11/2026 75.4
04/10/2026 81.3
B. Wabuska through Weber Reservoir

Roll over type of water (such as Surface Area) to see abbreviation. Negative losses are a gain; positive losses are a loss.

Date Weber Reservoir Net Loss
Wabuska through Weber
Net River Loss
Wabuska to Weber
Stage Previous
Day Storage
Storage Surface
Area
Unit
Precipitation
Precipitation Outflow Maximum
Temperature
Estimated
Evaporation (Entire Weber Reservoir)
Estimated
Evaporation (PW in Weber Res.)
ft ac-ft ac-ft ac in cfs cfs °F cfs cfs cfs cfs
04/16/2026 4207.46 10330 10260 889.8 0.00 0.0 120.0 56.5 2.40 0.00 3.9 1.5
04/15/2026 4207.53 10360 10330 892.2 0.00 0.0 117.0 63.9 3.40 0.00 7.1 3.7
04/14/2026 4207.57 10350 10360 893.6 0.00 0.0 79.6 67.3 3.87 0.00 -1.4 -5.3
04/13/2026 4207.56 10370 10350 893.2 0.00 0.0 76.0 59.7 2.84 0.00 25.0 22.2
04/12/2026 4207.59 10390 10370 894.3 0.14 5.3 76.6 51.3 1.70 0.00 0.3 3.9
04/11/2026 4207.61 10410 10390 895.0 0.00 0.0 76.4 63.1 3.31 0.00 1.8 -1.5
04/10/2026 4207.63 10400 10410 895.7 0.09 3.4 76.4 70.3 4.29 0.00 -2.4 -3.3
C. Weber Reservoir to Little Dam

Flow is in cfs. Loss/Gain Factor is unitless. Roll over type of water (such as Canal 1) to see abbreviation. Negative Loss/Gain Factor is loss rate; positive Loss/Gain Factor is gaining rate.

Date Flow at
Canal 1
Flow at
Canal 2
Flow at
Little Dam Gage
Loss/Gain Factor
04/16/2026 24.0 46.7 11.3 0.32
04/15/2026 17.8 28.1 32.9 0.33
04/14/2026 0.0 0.0 55.1 0.31
04/13/2026 0.0 0.0 53.8 0.29
04/12/2026 0.0 0.0 55.2 0.28
04/11/2026 7.9 0.0 43.8 0.32
04/10/2026 2.4 0.0 49.7 0.32
D. Little Dam to Walker Lake

Flow is in cfs. Roll over type of water (such as Flow into Walker Lake) to see abbreviation.

Date Flow into
Walker Lake
04/16/2026 50.7
04/15/2026 72.0
04/14/2026 69.4
04/13/2026 69.2
04/12/2026 69.6
04/11/2026 70.0
04/10/2026 72.0

Program Water Schematic

Click on a triangle (gage) on the schematic to view graphs of daily program water (values in orange) and cumulative program water. Graphs will open in a separate window to aid in comparison of multiple sites.

4.5 cfs 4.4 cfs 4.3 cfs 8.8 ac-ft 3.0 cfs 3.2 cfs Walker River West Walker River East Walker River PW mouth PW webin TL PW webout PW ld WL Bridgeport Reservoir Little Dam Gage Flow into Walker Lake PW wab Wabuska Gage PW web Weber Reservoir Storage Weber Reservoir Inflow Weber Reservoir Outflow Topaz Lake Walker Lake WR Weber Reservoir BR LAKES & RESERVOIRS PROGRAM WATER EXPLANATION PW wab PW webin PW webout PW web PW mouth PW ld Canal 1 Canal 2 WR WL TL BR

Walker Lake

Daily Program Water
Cumulative Program Water