Built for anglers,
by anglers
Every feature in Thalweg was designed to solve real problems Pacific Northwest anglers face. From scattered data sources to privacy concerns, we have got you covered.
USGS Water Conditions
Live data from USGS monitoring stations across Pacific Northwest rivers. Updated every 15 minutes with historical trends.
River Flow Rates
Real-time discharge data (CFS) from USGS monitoring stations. Updated every 15 minutes.
Water Turbidity
Clarity measurements to know if conditions are fishable. Essential for sight fishing.
Water Temperature
Current and historical temperature data. Know when fish are most active.
Gage Height
Real-time water level readings. Track rising and falling conditions.
NOAA Weather & Forecasting
Official National Weather Service forecasts combined with fishing-relevant metrics like barometric pressure trends and precipitation timing.
NOAA Forecasts
Official weather service forecasts with hourly and daily predictions.
Barometric Pressure
Track pressure trends that influence fish feeding behavior.
Wind Conditions
Speed, direction, and gusts. Plan for comfortable and productive fishing.
Precipitation Timing
Know exactly when rain starts and stops. Time your trips accordingly.
NOAA CO-OPS Tides
Accurate tide predictions for coastal areas and tidal rivers. Essential for salmon, steelhead, and coastal fishing.
- High and low tide times with heights
- Tidal current predictions
- Multiple station support
- Historical tide data
- Integration with catch logs
Privacy-First Catch Logging
Your personal catch archive with automatic environmental snapshots. Protected by Row Level Security at the database level.
Row Level Security
Database-level security ensures only you can access your catch data. Not even our team can see it.
Photo Storage
Attach photos to your catch logs. Stored securely with automatic backup.
Environmental Snapshots
Automatically capture weather, water, and tide conditions when you log a catch.
Data Export
Export your complete catch history anytime. Your data, your control.
MapLibre GL with Offline Support
High-performance vector maps with station overlays, waypoint markers, and PMTiles for offline navigation in areas with no cell service.
MapLibre GL Integration
High-performance vector maps with smooth pan and zoom. Works great on mobile.
Waypoint Markers
Mark your spots, access points, and points of interest. Private to your account.
PMTiles Offline Support
Download map regions for offline use. Navigate without cell service.
Station Overlays
See USGS and NOAA stations directly on the map with current readings.
Pacific Northwest Species
Comprehensive species information for Pacific Northwest game fish. Includes regulations, seasonal patterns, and habitat preferences.
- Chinook, Coho, and Sockeye Salmon
- Steelhead and Rainbow Trout
- Cutthroat and Brown Trout
- Sturgeon and Shad
- Smallmouth and Largemouth Bass
- Walleye and Yellow Perch
Built for Privacy
Privacy is not a feature we added, it is the foundation we built on. Your fishing data deserves the same protection as your banking data.
Privacy by Design
Built from the ground up with privacy as a core principle, not an afterthought.
No Social Features
No public profiles, leaderboards, or sharing. Your fishing data stays private.
Minimal Data Collection
We only collect what is necessary to provide the service. No tracking or analytics.
Transparency
Clear documentation of what data we store and how it is used. No hidden practices.
Available on web and mobile
Use Thalweg on any device. The web app works great on desktop and mobile browsers. Native iOS and Android apps coming soon.
Web App
Works on any browser. Responsive design for desktop and mobile.
Available NowiOS App
Native iPhone and iPad app with offline support.
Coming SoonAndroid App
Native Android app with Material Design.
Coming SoonReady to try Thalweg?
Launch the web app and start exploring Pacific Northwest water conditions today. Free to use.
Free to use. No credit card required.