USGS Streamgage 12426000
Spokane River below Nine Mile Dam at Spokane, WA
Spokane River below Nine Mile Dam at Spokane, WA is USGS streamgage 12426000 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 5,220 square miles. Discharge records at this site go back to 1948. Typical flow runs near 2,146.5 cfs in July and 13,096.7 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.
View live conditions & forecast →
Gauge details
- State
- Washington
- Drainage area
- 5,220 sq mi
- Gauge elevation
- 1,542 ft
- Subbasin (HUC-8)
- 17010307
- Coordinates
- 47.78045, -117.5455
- USGS site number
- 12426000
- Records begin
- 1948-03-01 (78 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Spokane River below Nine Mile Dam at Spokane, WA. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 1,002 | 1,054 | 1,111 | ||
| 964 | 1,026 | 1,092 | ||
| 1,009 | 1,104 | 1,298 | ||
| 1,059 | 1,213 | 1,542 | ||
| 1,039 | 1,196 | 1,528 | ||
| 1,021 | 1,162 | 1,454 | ||
| 981 | 1,105 | 1,327 | ||
| 952 | 1,072 | 1,257 | ||
| 922 | 1,040 | 1,200 | ||
| 951 | 1,067 | 1,276 | ||
| 937 | 1,052 | 1,253 | ||
| 931 | 1,048 | 1,266 | ||
| 906 | 1,021 | 1,203 | ||
| 912 | 1,027 | 1,230 |
All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 79 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 | 3,032.6 | 4,756.5 | 11,661.3 | |
| February | 2,798.2 | 5,779 | 17,135.7 | |
| March | 3,835.8 | 10,354.2 | 25,054.8 | |
| April | 7,570 | 13,096.7 | 25,500 | |
| May | 6,779.4 | 17,406.5 | 31,574.2 | |
| June | 3,400.7 | 6,155.3 | 25,460 | |
| July | 1,326.5 | 2,146.5 | 6,896.8 | |
| August | 951 | 1,276.1 | 2,668.4 | |
| September | 1,002.2 | 1,386.7 | 2,079 | |
| October | 1,448.7 | 2,166.5 | 3,402.9 | |
| November | 2,364.7 | 3,174.3 | 6,272.7 | |
| December | 2,852.6 | 4,249 | 12,174.5 |
All values in cubic feet per second (cfs).
Common questions
- When does Spokane River below Nine Mile Dam at Spokane, WA normally run highest?
- May, on the long-term record. The median daily flow that month is about 17,406.5 cfs, against 1,276.1 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 below Nine Mile Dam at Spokane, WA?
- It depends on the month. In January, half of days historically fall near 4,756.5 cfs, with the middle 80% of days between 3,032.6 and 11,661.3 cfs. The month-by-month table on this page gives the full range.
- How long has Spokane River below Nine Mile Dam at Spokane, WA been measured?
- Discharge records at USGS site 12426000 begin in 1948, about 78 years, covering roughly 3,717 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Spokane River below Nine Mile Dam at Spokane, WA?
- Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
- Where is Spokane River below Nine Mile Dam at Spokane, WA?
- The gauge sits at 47.78045, -117.5455, in Washington, in hydrologic subbasin 17010307, at an elevation of about 1,542 feet, draining roughly 5,220 square miles.
- Can I use Spokane River below Nine Mile Dam at Spokane, 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 this page
- Spokane River at Long Lake, WA 6,020 sq mi