USGS Streamgage 09053500
Blue River above Green Mountain Reservoir, CO
Blue River above Green Mountain Reservoir, CO is USGS streamgage 09053500 in Colorado, monitoring river discharge in hydrologic subbasin 14010002. It sits on the Blue River, alongside 4 other gauges Rivermatics tracks on the same river. It drains a watershed of about 511 square miles. Discharge records at this site go back to 1943. Typical flow runs near 709.4 cfs in July and 184.7 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Colorado
- Drainage area
- 511 sq mi
- Gauge elevation
- 7,955 ft
- Subbasin (HUC-8)
- 14010002
- Coordinates
- 39.83193, -106.2228
- USGS site number
- 09053500
- Records begin
- 1943-10-01 (83 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 44 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 | 75.5 | 99.6 | 132.5 | |
| February | 74.4 | 96.4 | 124.4 | |
| March | 70.6 | 100.1 | 132.2 | |
| April | 120.1 | 184.7 | 430.2 | |
| May | 297.3 | 684.4 | 1,593.1 | |
| June | 522.5 | 1,431.7 | 2,693.7 | |
| July | 347.7 | 709.4 | 1,603.7 | |
| August | 253.2 | 409 | 738.8 | |
| September | 150 | 228.7 | 384.2 | |
| October | 128.2 | 178.7 | 272.3 | |
| November | 113.9 | 143.5 | 197.1 | |
| December | 83.2 | 114.6 | 148.5 |
All values in cubic feet per second (cfs).
Common questions
- When does Blue River above Green Mountain Reservoir, CO normally run highest?
- June, on the long-term record. The median daily flow that month is about 1,431.7 cfs, against 96.4 cfs in February, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Blue River above Green Mountain Reservoir, CO?
- It depends on the month. In January, half of days historically fall near 99.6 cfs, with the middle 80% of days between 75.5 and 132.5 cfs. The month-by-month table on this page gives the full range.
- How long has Blue River above Green Mountain Reservoir, CO been measured?
- Discharge records at USGS site 09053500 begin in 1943, about 83 years. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Blue River above Green Mountain Reservoir, CO?
- The gauge sits at 39.83193, -106.2228, in Colorado, in hydrologic subbasin 14010002, at an elevation of about 7,955 feet, draining roughly 511 square miles.
- Can I use Blue River above Green Mountain Reservoir, CO 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 Blue River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Blue River in full.
- Blue River at Blue River, CO 42 sq mi
- Blue River near Dillon, CO 123 sq mi
- Blue River below Dillon, CO 334 sq mi
- Blue River above Green Mountain Reservoir, CO this page
- Blue River below Green Mountain Reservoir, CO 597 sq mi
Other gauges in this subbasin
- Elliott Creek Feeder Canal to Green Mtn Reservoir, CO
- Blue River below Green Mountain Reservoir, CO
- Monte Cristo Diversion near Hoosier Pass, CO
- Bemrose-Hoosier Diversion near Hoosier Pass, CO
- McCullough-Sp-Crys-Diversion near Hoosier Pass, CO
- Blue River at Blue River, CO
- Blue River near Dillon, CO
- Snake River near Montezuma, CO