USGS Streamgage 12433000
Spokane River at Long Lake, WA
Spokane River at Long Lake, WA is USGS streamgage 12433000 in Washington, monitoring river discharge in hydrologic subbasin 17010307. It sits on the Spokane River, alongside 5 other gauges Rivermatics tracks on the same river. It drains a watershed of about 6,020 square miles. Discharge records at this site go back to 1939. Typical flow runs near 3,054.2 cfs in July and 14,506.7 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 6,020 sq mi
- Gauge elevation
- 1,366 ft
- Subbasin (HUC-8)
- 17010307
- Coordinates
- 47.83655, -117.84135
- USGS site number
- 12433000
- Records begin
- 1939-04-01 (87 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 88 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 3,671.3 | 5,886.8 | 12,032.3 | |
| February | 3,967.9 | 6,864.1 | 16,086.2 | |
| March | 4,803.9 | 9,278.7 | 18,700 | |
| April | 6,655.7 | 14,506.7 | 24,010 | |
| May | 6,924.5 | 17,871 | 28,612.9 | |
| June | 3,898.3 | 8,900 | 21,206.7 | |
| July | 1,669 | 3,054.2 | 5,255.2 | |
| August | 1,065.2 | 1,853.5 | 2,890.6 | |
| September | 1,288 | 2,154 | 3,057.3 | |
| October | 1,856.1 | 2,794.8 | 3,874.8 | |
| November | 2,578 | 3,597.3 | 5,892.7 | |
| December | 3,041 | 4,969 | 11,144.2 |
All values in cubic feet per second (cfs).
Common questions
- When does Spokane River at Long Lake, WA normally run highest?
- May, on the long-term record. The median daily flow that month is about 17,871 cfs, against 1,853.5 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Spokane River at Long Lake, WA?
- It depends on the month. In January, half of days historically fall near 5,886.8 cfs, with the middle 80% of days between 3,671.3 and 12,032.3 cfs. The month-by-month table on this page gives the full range.
- How long has Spokane River at Long Lake, WA been measured?
- Discharge records at USGS site 12433000 begin in 1939, about 87 years, covering roughly 9,125 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Spokane River at Long Lake, WA?
- The gauge sits at 47.83655, -117.84135, in Washington, in hydrologic subbasin 17010307, at an elevation of about 1,366 feet, draining roughly 6,020 square miles.
- Can I use Spokane River at Long Lake, WA 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.
Upstream and downstream on the Spokane River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Spokane River in full.
- Spokane River below Blackwell near Coeur D Alene, ID 3,702 sq mi
- Spokane River near Post Falls, ID 3,840 sq mi
- Spokane River below N Greene St at Spokane, WA 4,220 sq mi
- Spokane River at Spokane, WA 4,290 sq mi
- Spokane River below Nine Mile Dam at Spokane, WA 5,220 sq mi
- Spokane River at Long Lake, WA this page