2 USGS Streamgages · Klamath River system
Lost River flows and levels
Lost River is gauged at 2 USGS streamgages in Oregon, each tracked by Rivermatics. The mainstem runs about 117 miles (189 km) from headwaters to outlet. It drains into the Klamath River system. It drains roughly 1,639 square miles at its outlet.
Gauges on this river, upstream to downstream
Ordered by drainage area, which is how far down the river each gauge sits. April and July figures are long-term median daily flows for that month from the USGS record — historical normals, not a forecast and not today's reading.
| Gauge | State | Drainage sq mi | Elevation ft | April p50 cfs | July p50 cfs | Forecast |
|---|---|---|---|---|---|---|
| Lost River at Wilson Dam, at Henley, OR | OR | — | 4,098 | — | — | — |
| Lost River below Malone Dam at Gift Road | OR | — | 4,121 | — | — | — |
Common questions
- How many gauges are on the Lost River?
- Rivermatics tracks 2 USGS streamgages on the Lost River, across Oregon. Each has its own page with the site's full flow record and monthly normals. The river may carry other gauges that publish neither daily values nor discharge statistics; those are not tracked here.
- What river system is the Lost River part of?
- The Lost River drains into the Klamath River system — it is a tributary somewhere in that chain, following the flowpath down to its terminal river. Rivermatics builds this from the USGS/geoconnex reference-mainstem network rather than from names.
- Can I use Lost River data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.
Other rivers in the Klamath River system
- Trinity River 4 gauges
- Scott River 2 gauges
- Shasta River 2 gauges