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Idaho Water Facts
- State Water Surface Area
- 880 Square Miles
- Number of Lakes
- More than 2,000 — 1,228 of which have been named
- Largest Lake
- Pend Oreille — 148 Square Miles
- Deepest Lake
- Pend Oreille — sounded to a depth of 1,140 feet
- Highest Waterfall
- Big Fiddler Creek, South Fork Boise River — 600 feet
- Miles of Streams and Rivers
- 93,000 miles
- Number of Named Streams and Rivers
- 8,941 plus 1,478 named springs
- Longest River
- Snake River — 779 miles from entry at the Wyoming border to exit at Washington border.
- Average Annual Precipitation
- Varies from less than 10 to more than 60 inches.
- Most Precipitation in 24-Hour Period
- 7.7 inches of rain — Rattlesnake Creek in 1909
- Annual Stream Inflow to State
- About 37 million acre-feet
- Annual Stream Outflow from State
- About 75 million acre-feet
- Irrigated Area of State
- 3.3 million acres — of which about 3.0 million is irrigated from the Snake River system.
- Highest Dam
- Dworshak, North Fork Clearwater — 717 feet
- Active Reservoir Storage Capacity
- 12,384,000 acre-feet
- Largest Active Storage Reservoir
- Dworshak — 2,016,000 acre-feet
- Snake Plain Aquifer Storage
- Top 100 feet of aquifer — about 100 million acre-feet
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