Blue River below Green Mountain Reservoir, CO

Gauge details

State

Colorado

Drainage area

597 sq mi

Gauge elevation

7,736 ft

Subbasin (HUC-8)

14010002

Coordinates

39.88026, -106.33392

USGS site number

09057500

Records begin

1937-10-01 (89 years)

Rivermatics forecast

14-day flow outlook

14-day flow forecast

Based on observations through September 10 for Blue River below Green Mountain Reservoir, CO. 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.

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 84 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

All values in cubic feet per second (cfs).

Common questions

When does Blue River below Green Mountain Reservoir, CO normally run highest?

July, on the long-term record. The median daily flow that month is about 600.1 cfs, against 245.5 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 below Green Mountain Reservoir, CO?

It depends on the month. In January, half of days historically fall near 254.3 cfs, with the middle 80% of days between 147 and 458.9 cfs. The month-by-month table on this page gives the full range.

How long has Blue River below Green Mountain Reservoir, CO been measured?

Discharge records at USGS site 09057500 begin in 1937, about 89 years, covering roughly 9,200 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.

Is there a flow forecast for Blue River below Green Mountain Reservoir, CO?

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 Blue River below Green Mountain Reservoir, CO?

The gauge sits at 39.88026, -106.33392, in Colorado, in hydrologic subbasin 14010002, at an elevation of about 7,736 feet, draining roughly 597 square miles.

Can I use Blue River below 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 511 sq mi
• Blue River below Green Mountain Reservoir, CO this page

Other gauges in this subbasin

• 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
• Keystone Gulch near Dillon, CO
• Tenmile Creek below North Tenmile C, at Frisco, CO