Starter $9/mo · 10 watches · every 15 min. Plus $19/mo · 40 watches · every 5 min. We email a confirmation link first; webhooks confirm at checkout.
River flow alerts
Pick a gauge from the list, or type any USGS site number. We read the latest value USGS publishes, in cubic feet per second (cfs) or gage height in feet.
We email once when a fresh USGS reading crosses your line. If it's already past the line, we wait for it to come back and cross. After an alert we stay quiet until the reading moves back past the line by a small margin. Ice, missing, seasonal, or 6-hour-old readings don't count. Provisional readings are labeled in the email.
New to flow numbers? Fly Fishing for Nerds on reading river flows and water temperature for trout.
Gauges by state
Alabama 2
Alabama readings
Alaska 2
Alaska readings
Arizona 2
Arizona readings
Arkansas 2
Arkansas readings
California 6
California readings
Colorado 13
- Animas River at Durango, CO
- Arkansas River at Parkdale, CO
- Blue River below Dillon, CO
- Cache la Poudre River at Fort Collins, CO
- Colorado River below Glenwood Springs, CO
- Colorado River near Kremmling, CO
- Eagle River below Gypsum, CO
- Fryingpan River near Ruedi, CO
- Gunnison River below Gunnison Tunnel, CO
- Roaring Fork River at Glenwood Springs, CO
- South Platte River below Brush Creek near Trumbull, CO
- Taylor River below Taylor Park Reservoir, CO
- Yampa River at Steamboat Springs, CO
Colorado readings
Connecticut 2
Connecticut readings
Delaware 1
Delaware readings
Florida 3
Florida readings
Georgia 2
Georgia readings
Idaho 10
- Henry's Fork near Ashton, ID
- Henry's Fork near Island Park, ID
- Lochsa River near Lowell, ID
- Middle Fork Salmon River at Middle Fork Lodge near Yellow Pine, ID
- Salmon River at White Bird, ID
- Selway River near Lowell, ID
- Snake River near Heise, ID
- South Fork Payette River at Lowman, ID
- St. Joe River at Calder, ID
- Teton River near St. Anthony, ID
Idaho readings
Illinois 1
Illinois readings
Indiana 2
Indiana readings
Iowa 1
Iowa readings
Kentucky 3
Kentucky readings
Maine 3
Maine readings
Maryland 2
Maryland readings
Massachusetts 2
Massachusetts readings
Michigan 4
Michigan readings
Minnesota 2
Minnesota readings
Mississippi 1
Mississippi readings
Missouri 3
Missouri readings
Montana 14
- Beaverhead River near Twin Bridges, MT
- Big Hole River near Melrose, MT
- Bighorn River below Yellowtail Afterbay Dam near St. Xavier, MT
- Bitterroot River near Missoula, MT
- Blackfoot River near Bonner, MT
- Clark Fork above Missoula, MT
- Flathead River at Columbia Falls, MT
- Gallatin River near Gallatin Gateway, MT
- Madison River at Kirby Ranch near Cameron, MT
- Missouri River below Holter Dam near Wolf Creek, MT
- Rock Creek near Clinton, MT
- Smith River near Eden, MT
- Stillwater River near Absarokee, MT
- Yellowstone River at Corwin Springs, MT
Montana readings
Nebraska 1
Nebraska readings
Nevada 2
Nevada readings
New Hampshire 2
New Hampshire readings
New Jersey 2
New Jersey readings
New Mexico 4
New Mexico readings
New York 8
New York readings
North Carolina 4
North Carolina readings
Ohio 2
Ohio readings
Oklahoma 2
Oklahoma readings
Oregon 7
Oregon readings
Pennsylvania 6
Pennsylvania readings
Rhode Island 1
Rhode Island readings
South Carolina 2
South Carolina readings
South Dakota 2
South Dakota readings
Tennessee 3
Tennessee readings
Texas 3
Texas readings
Utah 4
Utah readings
Vermont 2
Vermont readings
Virginia 4
Virginia readings
Washington 6
Washington readings
West Virginia 5
West Virginia readings
Wisconsin 5
Wisconsin readings
Wyoming 4
Wyoming readings
A different kind of alert? Suggest an alert.
