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.
River Briefings
At-a-glance intelligence for your tracked rivers. Conditions rated Optimal, Good, or Fair with AI-powered summaries and activity windows.
Condition Ratings
Each river is rated Optimal, Good, or Fair based on visibility, flow, pressure, and temperature.
Visibility & Flow
Real-time USGS clarity and discharge data. Know if conditions are fishable before you drive.
Pressure & Temperature
Current barometric pressure trends and water temperature — key factors for fish activity.
AI-Powered Briefings
Intelligent summaries of conditions with activity windows and technique recommendations.
Fishing Conditions Score
A single score combining barometric pressure, moon phase, wind, and weather to tell you when conditions are prime. Plus hourly and 7-day forecasts.
Fishing Conditions Score
A single number combining pressure, moon phase, wind, and weather — rated from 0 to 100.
Barometric Pressure
Track rising and falling pressure trends that directly influence fish feeding behavior.
Activity Windows
Solunar-based Major and Minor bite windows so you know the best times to be on the water.
Moon Phase & Wind
Moon phase feeding indicators and wind conditions for casting — all in one view.
Fish Passage Intelligence
Live dam count data aggregated from DART, Fish Passage Center, NOAA, and state agencies. Track salmon, steelhead, and other species at major dams.
Dam Counts
Live fish counts from DART, FPC, and NOAA at major Columbia and Snake River dams.
Species Breakdown
Detailed counts by species — Chinook, Coho, Sockeye, Steelhead, and more.
Trend Analysis
24-hour, 7-day, and seasonal totals with sparkline trend indicators.
Five Agency Sources
Aggregated data from DART, FPC, NOAA, ODFW, and WDFW monitoring programs.
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
Your Private Field Journal
Log activities with GPS data, environmental snapshots, and field notes. Private by default with controls over what gets shared.
Private by Default
Strong access controls keep your catch data private to your account unless you choose to share 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.
Interactive Maps
Explore river conditions with station overlays, waypoint markers, and offline-ready navigation for areas with no cell service.
Interactive Map Layers
Fast, touch-friendly maps with smooth pan and zoom across desktop and mobile.
Waypoint Markers
Mark your spots, access points, and points of interest. Private to your account.
Offline Map Access
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.
Private Sharing Controls
Streams sharing is always opt-in, never public, and lets you control exactly what details friends can see.
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. Night Vision Mode for low-light field conditions.
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.
Paid app access with account pricing details coming soon.