Keep secret spots
secret
Thalweg was born from a simple frustration: checking five different government websites before every fishing trip while worrying about protecting favorite spots from oversharing apps.
Our Mission
We believe anglers deserve a single, consolidated source for environmental intelligence without sacrificing their privacy. Other apps want you to share your spots, photos, and catches publicly. We do not.
Today the pre-launch web app focuses on river intelligence, biological coverage, a private Locker field journal, and Safety Check-In. Explicit sharing via Streams & Drops and full mobile/offline parity are planned next.
Thalweg
/ˈtälˌveg/ - The line of deepest points
along a river channel
Our Values
The principles that guide how we build and operate Thalweg.
Privacy First
Your fishing data is private by default with strong access controls and clear sharing choices.
Open Data
We turn fragmented public environmental and biological data into one readable product surface.
Regional Focus
Built specifically for Pacific Northwest waters. We understand the unique fishing opportunities and challenges of this region.
Passion Project
Thalweg was built by anglers who were frustrated with checking multiple websites before every trip.
Built for the Pacific Northwest
Thalweg is not a generic fishing app trying to cover every lake and pond in America. We are focused on Pacific Northwest waters: Oregon, Washington, Idaho, the Columbia system, and the coastal and tidal fisheries anglers in this region actually plan around.
This regional focus lets us invest in the data sources, species timing, and field workflows that matter here instead of spreading the product thin. From Columbia salmon systems to steelhead rivers and coastal tides, the goal is depth, not generic national coverage.
Data Sources
We aggregate data from trusted government agencies and open data providers. All environmental data is publicly available; we just make it easier to access.
USGS NWIS
Water conditions including flow, temperature, and turbidity
NOAA + NWS
Weather forecasts, marine alerts, pressure trends, tides, and currents
Fish Passage Center + DART
Regional fish passage counts and run-timing context at major dams
ODFW / WDFW / IDFG
Fishing reports, sport catch, hatchery releases, and stocking context
CRITFC / StreamNet / Yakama
Tribal and regional biological coverage beyond standard agency feeds
Open-Meteo + MapTiler
Weather visualization support and interactive mapping layers
Get in Touch
Have questions, feedback, or want to report a bug? We would love to hear from you.