For river anglers

River fishing
deserves better
than a solunar clock.

Lake apps treat rivers as an afterthought. Cast & Scan integrates live gauge data from USGS, Environment Agency, Pegelonline and IMGW to score bite windows that actually account for what river fish respond to: flow trend, water level, and the conditions that follow rain.

Scan a river now

Live flow trend

Rising, stable, falling — and how fast. Flow change is the single biggest predictor for river bite, more than pressure or solunar combined.

Multi-source gauge data

USGS in the US, Environment Agency in the UK, Pegelonline in Germany, IMGW in Poland. Nearest-station with 40km radius, fallback across borders.

Post-peak bite detection

The window after a flood crest is the most productive river fishing on Earth. Our peak-detector flags it within minutes of crest.

Per-species river weights

Stream trout cares about flow + hatch, river pike about clarity + drift, river barbel about temperature + level. Different weights, same engine.

Why river fishing is different

On a lake, the dominant variables are weather and solunar. On a river, flow is so dominant that everything else becomes secondary — a falling barometer with rising muddy water is still a blank session. River anglers know this. Most apps don't.

The Cast & Scan scoring engine treats flow as a first-class factor for any spot tagged as a river. Live gauge data from the nearest station within 40 km is pulled at scan time, the trend over the last 24h is computed, and the score is reweighted accordingly:

Stable flow — full weight on weather, light, solunar.
Slow rising — moderate boost to predator species (food disturbed, fish opportunistic).
Sharp rising into peak — heavy penalty (visibility crashes, fish move out of channel).
Post-peak falling — strong boost (fish recolonising clearing water — the prime window).
Long stable low — penalty for warm-water species, boost for predators concentrated in pools.

Coverage by region

Wherever a recognised gauge sits within 40 km of your scan point, you get live flow data. Fallback to the next-nearest provider across borders means dual coverage at the US/Canada and EU/non-EU lines. Approximate coverage today:

Region	Source	Coverage
United States	USGS Water Data	Comprehensive
United Kingdom	Environment Agency	Comprehensive (England)
Germany	Pegelonline	Major rivers, federal coverage
Poland	IMGW Hydro	Major rivers
Other EU	—	Coming via EFAS integration
Other regions	—	Pressure/weather only — no gauge data yet

Daily river reports with live gauge data

These rivers have a standing report page tied to a specific gauge, so each one carries the measured water temperature and 24-hour flow trend for that reach alongside the bite score:

Kenai River (Soldotna) fishing report — Alaska, USA
Amsterdam Canals fishing report — Amsterdam, Netherlands
North Fork River (Norfork) fishing report — Arkansas, USA
White River (Bull Shoals) fishing report — Arkansas, USA
Rhône (Lyon) fishing report — Auvergne-Rhône-Alpes, France
River Thames (Reading) fishing report — Berkshire, England
Mörrumsån fishing report — Blekinge, Sweden
Danube (Budapest) fishing report — Budapest, Hungary
American River (Fair Oaks) fishing report — California, USA
Feather River (Oroville) fishing report — California, USA
Sacramento–San Joaquin Delta fishing report — California, USA
Trinity River (Lewiston) fishing report — California, USA
Truckee River (Farad) fishing report — California, USA
Animas River (Durango) fishing report — Colorado, USA
Blue River (Silverthorne) fishing report — Colorado, USA
Colorado River (Kremmling) fishing report — Colorado, USA
Eagle River (Gypsum) fishing report — Colorado, USA
Roaring Fork River (Glenwood Springs) fishing report — Colorado, USA
Housatonic River (Lower) fishing report — Connecticut, USA
West Branch Farmington River (Riverton) fishing report — Connecticut, USA
Elbe (Hamburg) fishing report — Hamburg, Germany
River Test fishing report — Hampshire, England
River Wye (Hereford) fishing report — Herefordshire, England
Henry's Fork (Lower) fishing report — Idaho, USA
Salmon River (White Bird) fishing report — Idaho, USA
South Fork Snake River (Irwin) fishing report — Idaho, USA
Seine (Paris) fishing report — Île-de-France, France
Soča fishing report — Julian Alps, Slovenia
Cumberland River (Wolf Creek) fishing report — Kentucky, USA
Curonian Lagoon fishing report — Klaipėda, Lithuania
Wisła (Włocławek) fishing report — Kujawy, Poland
River Shannon (Lower) fishing report — Limerick, Ireland
Po River (Cremona) fishing report — Lombardy, Italy
Penobscot River (Eddington) fishing report — Maine, USA
Chesapeake Bay fishing report — Maryland/Virginia, USA
Rügen Bodden fishing report — Mecklenburg-Vorpommern, Germany
Au Sable River (Foote Dam) fishing report — Michigan, USA
Au Sable River (Mio) fishing report — Michigan, USA
Grand River (Lower) fishing report — Michigan, USA
Manistee River (Tippy Dam) fishing report — Michigan, USA
Muskegon River (Croton) fishing report — Michigan, USA
St. Joseph River (Niles) fishing report — Michigan, USA
White River (Whitehall) fishing report — Michigan, USA
Big Hole River (Melrose) fishing report — Montana, USA
Bighorn River (Fort Smith) fishing report — Montana, USA
Bitterroot River (Missoula) fishing report — Montana, USA
Blackfoot River (Bonner) fishing report — Montana, USA
Gallatin River (Logan) fishing report — Montana, USA
Kootenai River (Libby Dam) fishing report — Montana, USA
Madison River (Ennis) fishing report — Montana, USA
Missouri River (Craig) fishing report — Montana, USA
Yellowstone River (Livingston) fishing report — Montana, USA
San Juan River (Quality Waters) fishing report — New Mexico, USA
Genesee River (Rochester) fishing report — New York, USA
Salmon River (Pulaski) fishing report — New York, USA
St. Lawrence River (Thousand Islands) fishing report — New York, USA
Delaware River (Callicoon) fishing report — New York/Pennsylvania, USA
French Broad River (Asheville) fishing report — North Carolina, USA
Watauga River (Sugar Grove) fishing report — North Carolina, USA
Rhine (Cologne) fishing report — North Rhine-Westphalia, Germany
Rocky River (Berea) fishing report — Ohio, USA
Bay of Quinte fishing report — Ontario, Canada
Ottawa River fishing report — Ontario/Quebec, Canada
Deschutes River (Sherars Falls) fishing report — Oregon, USA
John Day River (Lower) fishing report — Oregon, USA
McKenzie River (Vida) fishing report — Oregon, USA
Rogue River (Grants Pass) fishing report — Oregon, USA
Sandy River (Bull Run) fishing report — Oregon, USA
Umpqua River (Elkton) fishing report — Oregon, USA
Juniata River (Newport) fishing report — Pennsylvania, USA
Lehigh River (Francis E. Walter Dam) fishing report — Pennsylvania, USA
Susquehanna River fishing report — Pennsylvania, USA
Youghiogheny River (Confluence) fishing report — Pennsylvania, USA
Dunajec (Upper) fishing report — Podhale, Poland
San River (San Valley) fishing report — Podkarpacie, Poland
Vltava (Prague) fishing report — Prague, Czechia
Clinch River (Kyles Ford) fishing report — Tennessee, USA
Guadalupe River (Canyon Tailwater) fishing report — Texas, USA
Green River (Flaming Gorge) fishing report — Utah, USA
James River (Cartersville) fishing report — Virginia, USA
North Fork Shenandoah (Strasburg) fishing report — Virginia, USA
Cowlitz River (Castle Rock) fishing report — Washington, USA
Methow River (Pateros) fishing report — Washington, USA
Skagit River (Marblemount) fishing report — Washington, USA
Wenatchee River (Monitor) fishing report — Washington, USA
Yakima River (Union Gap) fishing report — Washington, USA
New River (Thurmond) fishing report — West Virginia, USA
Milwaukee River (Harbor) fishing report — Wisconsin, USA
Root River (Racine) fishing report — Wisconsin, USA
Green River (Fontenelle) fishing report — Wyoming, USA
Wind River (Boysen) fishing report — Wyoming, USA

What you do, what we do

On the scanner: pick "River" as your water type, drop a pin on the section you fish, choose your species. We pull the nearest gauge, compute the flow trend, and produce three ranked bite windows for the next 24h with the flow factor weighted in. No signup, no install, nothing to pay.