| Quantity | Unit | |
|---|---|---|
| Age1 | 72 | Years |
| Watershed Area2 | 138.67 | Square miles |
| Reservoir: | ||
| Area at spillway stage: | ||
| Original | 277.87 | Acres |
| At date of survey | 151.32 | Acres |
| Loss of area | 126.55 | Acres |
| Storage capacity to spillway level: | ||
| Original | 1677.39 | Acre-feet |
| At date of survey | 682.86 | Acre-feet |
| Capacity per square mile of drainage area:2 | ||
| Original | 12.10 | Acre-feet |
| At date of survey | 4.92 | Acre-feet |
| Sedimentation: | ||
| Sediment above crest3, 4 | 479.35 | Acre-feet |
| Sediment below crest | 994.53 | Acre-feet |
| Total sediment | 1473.88 | Acre-feet |
| Average annual accumulation: | ||
| From entire drainage area2 | 0.15 | Acre-feet |
| Per 100 square miles of drainage area5 | 14.81 | Acre-feet |
| Per acre of drainage area:5 | ||
| By volume | 10.08 | Cubic feet |
| By weight6 | 0.37 | Ton |
| Depletion of storage: | ||
| Loss of original capacity:7, 8 | ||
| Per year | 0.82 | Percent |
| To date of survey | 59.29 | Percent |
1 Storage began 1871, no month given, June assumed; average date of survey, June 1939.
2 Including area of lake.
3 Including 129.20 acre-feet of redeposited material on the delta dredged from below crest in 1937.
4 Does not include above-crest deposits above Range 14, because these are considered valley deposits.
5 Excluding area of lake.
6 Using weighted average of 14 sediment samples, (weighted according to relative volume of total sediment estimated to be represented by each) equaling 72.48 pounds per cubic foot.
7 As of the 1939 survey.
8 In 1937 an estimated 155.18 acre-feet of sediment was removed from the lake and redeposited on the delta. The measured volume of the redeposited material, 129.20 acre-feet, was corrected in accordance with the difference in the average weights of the below-crest sediments (56.70 pounds per cubic foot) and the redeposited sediments (68.10 pounds per cubic foot), to arrive at this estimate.