Idaho fishing, hunting & river flow maps.

Anadromous water

Steelhead, 500 miles from salt.

Idaho’s steelhead and salmon swim more than 500 miles up the Columbia and Snake to reach the Clearwater and Salmon rivers. Timing them is a flow game: Baseline Maps puts real-time CFS for the Clearwater, Snake, and Salmon systems next to the historical median for the date, so you fish the window instead of guessing at it.

FAQ

Idaho questions, answered.

What app shows Idaho river flows in real time?

Baseline Maps shows real-time flow (CFS), water temperature, and gauge height for 171 Idaho rivers, pulled directly from USGS streamgages and refreshed every 15 minutes. Today’s reading is plotted against the historical median for the date, so you can tell at a glance whether a river is fishable.

How many hunting units are in Idaho?

Idaho Fish and Game divides the state into 99 game management units, numbered 1 through 78 with lettered subunits like 60A. Baseline Maps carries all 99 unit boundaries, each with season dates and regulations.

Which Idaho rivers hold steelhead and salmon?

The Clearwater, Snake, and Salmon river systems carry Idaho’s steelhead and salmon runs — fish that swim more than 500 miles from the Pacific. Baseline Maps tracks real-time flow on all three systems plus their major forks, so you can time the run against the water.

Is there a map of public land in Idaho for hunting?

Yes. Baseline Maps overlays land ownership on every Idaho unit — public versus private, plus BLM, US Forest Service, and state endowment land boundaries — with private-parcel lines and owner information covering all 44 Idaho counties.

Which Idaho rivers have USGS flow gauges?

Most major fishing rivers do: the Clearwater, Salmon, Snake, Boise, Payette, Henrys Fork, Teton, Big Wood, Kootenai, Coeur d’Alene, St. Joe, Lochsa, and Selway all report real-time flow. Baseline Maps monitors 171 Idaho rivers and forks in total.

Does the app work offline in Idaho’s backcountry?

Yes. Topo, hillshade, satellite imagery, parcels, and unit boundaries can all be saved for offline use before you leave cell coverage — built for the Frank Church wilderness and the Selway country where there is no signal for days.

How current is the river flow data?

Flow data comes straight from the USGS Water Services feed, which updates roughly every 15 minutes. Baseline Maps does not resample or smooth it — what the gauge reports is what you see.