Blue River (CO) below Green Mountain Reservoir, CO

River level and flood forecast · Summit County

Normal3.3 ftas of Mon 2 PM

The river is 7.2 ft below flood stage (10.5 ft).

Forecast to hold near 3.3 ft through Mon, Oct 19, 6 AM.

Flow: 155 cubic feet per second (USGS).

The last 7 days and the forecast

24681012TueThuSatMonWedFriSunAction 10 ftFlood 10.5 ftModerate 11 ftMajor 12 ftNowObserved (ft)NWS forecast

NWS forecast issued Mon, Oct 12, 9:08 AM. Forecasts change as rain falls and as upstream water arrives.

Flood stages

Major flood stage12 ft
Moderate flood stage11 ft
Flood stage10.5 ft
Action stage10 ft
Record crest (July 12, 1995)10.85 ft

What floods at each level

From the National Weather Service, highest first.

  • 12 ftThis is a major, life-threatening flood especially in the steep canyon immediately downstream of Green Mountain Reservoir. There is widespread inundation of low lying properties along the Blue River with extensive flooding of roads and bridges along and crossing the river.
  • 11 ftModerate flooding will be especially dangerous in the steep canyon immediately downstream of Green Mountain Reservoir. Buildings near the river flood. Debris damming on the upriver side of bridges may result in flooding of bridge approaches.
  • 10.5 ftRanchlands flood and structures begin to flood along the Blue River below Green Mountain Reservoir.
  • 10 ftLow lying areas flood along the Blue River below Green Mountain Reservoir.
  • 9.2 ftWithout mitigation, water begins to impact low lying areas along the river.

Highest crests on record

  1. 10.85 ft — July 12, 1995
  2. 10.22 ft — July 1, 1984
  3. 10.13 ft — July 8, 1957
  4. 10.12 ft — July 11, 2011
  5. 9.88 ft — June 24, 1997

Recent crests: 6.02 ft (July 29, 2021) · 7.2 ft (June 2, 2020) · 8.98 ft (July 4, 2019) · 6.19 ft (August 24, 2018) · 7.32 ft (June 8, 2017)

Up and down the river, and nearby

Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (BGMC2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.