State Water Surface Area ----------------------------------- 880 Square Miles
Number Of Lakes ------------------------------------------- More Than 2,000
Largest Lake -- Pend Oreille -------------------------------- 148 Square Miles
Deepest Lake -- Pend Oreille ------------------------------- More Than 1,100 Feet
Highest Waterfall--------------------- 600 feet, Big Fiddler Creek, Boise River Basin
Miles Of Streams and Rivers -------------------------------- 93,000 Miles
Longest River -- Snake River ------------------------------- 779 Miles
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, Idaho, 1909
Annual Stream Inflow to State ------------------------------ About 37 Million Acre-feet
Annual Stream Outflow to State----------------------------- About 75 Million Acre-feet
Irrigated Area of State -------------------------------------- 4 Million Acres
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

Conversion Factors

1 Miner's Inch---------------9 gallons per minute--------------0.02CFS
1 Cubic Foot of Water---------------7.4805 gallons---------------62.37 pounds
1 CFS -------448.83 gallons per minute-------26,930 gallons per hour------646,315 gallons per day
1 CFS-----1.9835 AF per day----59.502 AF per month------723.9775 AF per year
1 Acre-Foot----------enough water to cover 1 acre of land one foot deep
1 Acre-Foot----------43,560 cubic feet----------325,850 gallons
1 cubic meter per second---------35.31 CFS----------15,850 gallons per minute
1 Million Gallons----------------------------------------3.0689 Acre-Feet
1 Million Gallons Per Day ------------------------------1,120.147 Acre-Feet per year
10 Cents Per 1,000 Gallons------------------------------$32.59 Per AF