USGS Streamgage 12462600
Columbia River below Rock Island Dam, WA
Columbia River below Rock Island Dam, WA is USGS streamgage 12462600 in Washington, monitoring river discharge in hydrologic subbasin 17020010. It sits on the Columbia River, alongside 12 other gauges Rivermatics tracks on the same river. It drains a watershed of about 89,400 square miles. Discharge records at this site go back to 1961. Typical flow runs near 133,612.9 cfs in July and 111,526.7 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Washington
- Drainage area
- 89,400 sq mi
- Gauge elevation
- 598 ft
- Subbasin (HUC-8)
- 17020010
- Coordinates
- 47.33235, -120.08117
- USGS site number
- 12462600
- Records begin
- 1961-06-01 (65 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 65 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 | 70,441.9 | 106,709.7 | 150,032.3 | |
| February | 69,003.4 | 104,148.3 | 151,517.2 | |
| March | 60,858.1 | 98,209.7 | 154,548.4 | |
| April | 64,710 | 111,526.7 | 175,800 | |
| May | 98,722.6 | 154,580.6 | 238,548.4 | |
| June | 98,923.3 | 169,866.7 | 310,566.7 | |
| July | 81,661.3 | 133,612.9 | 227,580.6 | |
| August | 72,254.8 | 104,641.9 | 149,516.1 | |
| September | 50,930 | 74,093.3 | 100,693.3 | |
| October | 53,245.2 | 74,067.7 | 98,654.8 | |
| November | 63,666.7 | 89,986.7 | 112,933.3 | |
| December | 69,774.2 | 99,348.4 | 138,161.3 |
All values in cubic feet per second (cfs).
Common questions
- When does Columbia River below Rock Island Dam, WA normally run highest?
- June, on the long-term record. The median daily flow that month is about 169,866.7 cfs, against 74,067.7 cfs in October, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Columbia River below Rock Island Dam, WA?
- It depends on the month. In January, half of days historically fall near 106,709.7 cfs, with the middle 80% of days between 70,441.9 and 150,032.3 cfs. The month-by-month table on this page gives the full range.
- How long has Columbia River below Rock Island Dam, WA been measured?
- Discharge records at USGS site 12462600 begin in 1961, about 65 years, covering roughly 9,074 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Columbia River below Rock Island Dam, WA?
- The gauge sits at 47.33235, -120.08117, in Washington, in hydrologic subbasin 17020010, at an elevation of about 598 feet, draining roughly 89,400 square miles.
- Can I use Columbia River below Rock Island Dam, 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 Columbia River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Columbia River in full.
- Columbia River at International Boundary 59,700 sq mi
- Columbia River at Grand Coulee, WA 74,700 sq mi
- Columbia River at Bridgeport, WA 75,700 sq mi
- Columbia River below Wells Dam, WA 86,100 sq mi
- Columbia River at Rocky Reach Dam, WA 87,800 sq mi
- Columbia River below Rock Island Dam, WA this page
- Columbia River below Priest Rapids Dam, WA 96,000 sq mi
- Columbia River at McNary Dam,Near Umatilla, OR 214,000 sq mi
- Columbia River at the Dalles, OR 237,000 sq mi
- Columbia River below Bonneville Dam, OR 239,900 sq mi
- Columbia River at Bonneville Dam Forebay, WA
- Columbia River at Cascade Island, WA
- Columbia River at the Dalles Dam Forebay, WA