Know the river before you drop the boat.
Tailwater flows follow dam releases, not just rain. Rivr puts USGS gauge readings, Army Corps dam data, and a rig plan in your pocket before you leave the truck.
The river's pulse, before you leave the truck.
Showing up to blown-out water or a surprise release ruins a trip. Rivr tracks current USGS gauge readings and dam generation schedules, translating complex hydrology into an actionable Wade and Boat score before you leave the truck.
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Live & predicted flow
Yesterday, today, and forecasted generation curves on one hydrograph. Where dams publish release schedules, Rivr models rising water so you never get caught off guard.
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Built-in condition scoring
A signature 0–100 score built for both wading and boating. Instead of calculating safe limits yourself, Rivr weighs discharge, ramp rates, and water temp into an immediate fishability score.
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Transparent score diagnostics
Tap into any river for the data behind the score: the observed readings, a 24-hour condition history for wade and boat, and plain notes on how the score was tested.
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Custom flow alerts
Set threshold notifications for flow or condition changes, so you know the moment your home reach drops into the safe wading zone or spikes from a dam release.
A guide's read on today's water.
Rivr turns USGS and Army Corps readings into plain advice: how fast the flow is changing, what that means for wading and boating, and what to tie on next.
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Rising or falling flow
See how quickly flow is changing, and get a head start before water hits your stretch of the river.
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A guide briefing
A short written briefing on the day's conditions. One paragraph with what's happening and what matters.
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A game plan
Where to start, what to change if it's quiet, and how to stay safe if a release is on the way.
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A weather window
Light, wind, and rain chance for the next 24 hours, with the best window called out. It judges the sky only, not the river.
Readings follow official USGS and Army Corps reporting schedules and are meant for planning. Always check water levels yourself at the ramp.
A rig plan for the water in front of you.
Rivr builds a full rig blueprint for current conditions: rod and line, leader and tippet, depth and weight, anchor fly and point fly.
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Matched to conditions
Method, leader, tippet, depth, and weight change as the river rises or falls.
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A species guide
See which trout are recorded at a site, how confident Rivr is, and pick the one the rig is built for.
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Checked against your boxes
Pattern picks that are in one of your saved boxes are flagged, so you know what you already carry.
Know the regulations for the reach you're on.
On rivers we've researched, special regulations, seasonal closures, harvest and slot limits, and gear rules are tied to the reaches where they apply.
| Reach | Rule | Details |
|---|---|---|
| Bull Shoals Dam to Wing Dike | Fishing Prohibited | Fishing is prohibited in this zone. |
| Bull Shoals Dam to Norfork Access | Harvest limit | Trout 14" and over must be released; all other trout species must be released. |
| Wing Dike to State Park Boundary | Catch and release | Catch-and-release rules apply Feb 1 – Oct 31. |
| Norfork Access to Hwy 58 at Guion | Harvest limit | Maximum 1 fish over 14" per day. Brown, cutthroat, tiger trout 24" minimum. |
Examples from the White River below Bull Shoals Dam in Arkansas, as last confirmed in August 2026. Regulations change, so always follow the state wildlife agency's published rules.
Every gauge, one search.
Search more than 7,700 USGS gauges and Army Corps dams, or browse them all on a map. Sites with curated agency data are marked so you know which ones to trust most.
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Search by name or state
Type a river or town, or scroll the list by state.
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Filter by agency
Switch between USACE, USGS, and TVA sites.
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Curated sites stand out
A green check marks the waters with curated agency data.
Where to launch, and what swims there.
Open a river for a short description, the fish recorded there, and a map of access points along the water.
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Fish on the water
Species recorded for the river, marked stocked or introduced.
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Access on the map
Boat ramps, wade access, and walk-in spots shown along the river.
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Your trips, in place
Logged trips show where you started, with the flow at that moment.
Your fly boxes, kept by hand.
Make a box for each water. Name it, pick a color and an icon, and fill it with patterns from the catalog or your own custom flies.
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Boxes with a color and icon
Name each box and see every fly you carry at a glance.
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Counts you control
Add flies, then tap plus and minus to keep the count right.
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Find a fly fast
Filter a box by fly type, or search inside it.
The river, on your Home Screen.
Pin a saved river as a small widget for flow and trend, or a larger one with a 24-hour graph and both scores. Lock Screen and Apple Watch versions are there too.
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Small
Flow, trend, and stage for one saved river.
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Medium and large
A 24-hour graph with Wade and Boat scores.
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Lock Screen and Watch
Flow at a glance, without opening the app.
Flow and scores, without the phone.
The Rivr watch app shows the same Wade and Boat scores and flow trend for your water, and lets you log a trip from your wrist.
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A glance at the river
Current flow, trend, a short hydrograph, and both scores, with how old the reading is.
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Start a trip
Pick the location, choose wade or boat, and start the clock.
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Count fish with a tap
Tap +1 for each fish, with undo and edit when your hands are wet.
