USGS Streamgage 12453700
Columbia River at Rocky Reach Dam, WA
Columbia River at Rocky Reach Dam, WA is USGS streamgage 12453700 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 87,800 square miles. Discharge records at this site go back to 1960. Typical flow runs near 130,290.3 cfs in July and 107,116.7 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Washington
- Drainage area
- 87,800 sq mi
- Gauge elevation
- 653 ft
- Subbasin (HUC-8)
- 17020010
- Coordinates
- 47.52429, -120.3023
- USGS site number
- 12453700
- Records begin
- 1960-10-01 (66 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 66 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 | 66,080.6 | 104,319.4 | 148,451.6 | |
| February | 66,417.2 | 101,596.6 | 150,931 | |
| March | 58,880.6 | 95,903.2 | 152,741.9 | |
| April | 60,870 | 107,116.7 | 171,266.7 | |
| May | 92,893.5 | 148,129 | 231,871 | |
| June | 94,136.7 | 163,333.3 | 300,800 | |
| July | 79,874.2 | 130,290.3 | 221,322.6 | |
| August | 71,590.3 | 103,719.4 | 147,064.5 | |
| September | 49,893.3 | 72,706.7 | 100,130 | |
| October | 52,003.2 | 72,793.5 | 98,077.4 | |
| November | 61,260 | 87,063.3 | 111,613.3 | |
| December | 65,406.5 | 96,571 | 135,387.1 |
All values in cubic feet per second (cfs).
Common questions
- When does Columbia River at Rocky Reach Dam, WA normally run highest?
- June, on the long-term record. The median daily flow that month is about 163,333.3 cfs, against 72,706.7 cfs in September, 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 at Rocky Reach Dam, WA?
- It depends on the month. In January, half of days historically fall near 104,319.4 cfs, with the middle 80% of days between 66,080.6 and 148,451.6 cfs. The month-by-month table on this page gives the full range.
- How long has Columbia River at Rocky Reach Dam, WA been measured?
- Discharge records at USGS site 12453700 begin in 1960, about 66 years, covering roughly 9,073 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Columbia River at Rocky Reach Dam, WA?
- The gauge sits at 47.52429, -120.3023, in Washington, in hydrologic subbasin 17020010, at an elevation of about 653 feet, draining roughly 87,800 square miles.
- Can I use Columbia River at Rocky Reach 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 this page
- Columbia River below Rock Island Dam, WA 89,400 sq mi
- 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