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Idaho Water Supply Committee Meeting
Southwest Idaho Report
April 11, 2014
Boise River Diversion Dam, April 11, 1909
63% of Boise System Capacity
76% of Payette System Capacity
Payette BasinBlack Canyon Dam, 1924
Payette River Runoff at Horseshoe Bend April 1 – July 31
30-yr Avg.
2009 2004 2002 2013 4/1/14 forecast
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,600,000
1,800,000
1,617,000
1,491,000
1,208,000
1,343,000
940,000
1,471,000
Ac
re-F
ee
t
`91% of Avg.
92% of Avg.
58% of Avg.
30-yr Avg.
2002 2004 2009 2013 4/1/14 forecast
0
100,000
200,000
300,000
400,000
500,000
481,000
446,000
457,000
469,000
349,000
460,000
Ac
re-F
ee
tCascade Reservoir Inflows
April 1 – July 31
95% of Avg.
92% of Avg.
73% of Avg.
30-yr Avg.
2002 2009 2010 2013 4/1/14 forecast
0
20,000
40,000
60,000
80,000
100,000
120,000
140,000
123,500
103,000
121,000117,000
88,000
114,000
Ac
re-F
ee
tDeadwood Reservoir Inflows
April 1 – July 31
92% of Avg.
98% of Avg.
Boise River Basin
Boise Basin RunoffApril 1 – July 31
30-yr Avg. 2008 2009 2013 4/1/14 forecast
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,261,0001,290,000
1,226,000
628,000
1,225,000
Ac
re-F
ee
t
97% of Avg.
102% of Avg.
S. Fork Boise (Anderson Ranch) RunoffMarch 1 – July 30
30-yr Avg. 2009 2008 2013 4/1/14 forecast
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
450,000
500,000
477,000464,000
440,000
242,000
445,000
Acr
e-F
eet
93% of Avg.
51% of Avg.
Owyhee Basin
Owyhee Reservoir near Leslie Gulch - 3/23/14
29% of normal runoff
18% of normal runoff
Owyhee Basin RunoffApril 1 – June 30
30-yr Avg. 1977 1992 2012 2013 4/1/14 forecast
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
353,000
68,00036,000 100,000
67,000 58,000
Acr
e-F
eet
10% of Avg.16% of Avg.
Owyhee Basin RunoffJanuary 1 – June 30
30-yr Avg. 1977 1992 2012 2013 4/1/14 forecast
0
100,000
200,000
300,000
400,000
500,000
600,000
700,000
653,000
124,000 113,000
240,000185,000 170,840
Acr
e-F
eet
17% of Avg.
26% of Avg.
Owyhee Reservoir in wetter times
