About GR8 Tracks

Live river levels, streamflow, and trail conditions — with offline maps for the backcountry. Get outside.

GR8 Tracks puts real-time conditions and the trails you care about on one map. Check streamflow and gage height before you paddle, find hiking and motorized/OHV routes, and download the area you need so it works with no cell signal.

Where the data comes from

• USGS Water Services — real-time streamflow & gage height from thousands of stream gauges.
• U.S. Forest Service — National Forest System Trails, including motorized/OHV use.
• OpenStreetMap — trails and the base map (© OpenStreetMap contributors).
• Recreation.gov — campgrounds and recreation facilities.

All sourced from free, public data. Conditions are provisional — always check official sources and use good judgment in the field.