Blue River (CO) below Green Mountain Reservoir

Last updated: Jul 16, 2025, 3:37 AM UTC

No watches, warnings or advisories are in effect for this area.

Warning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.

US Geological Survey
Observations courtesy of U.S. Geological Survey

Scale to Flood Categories

Auto Refresh

Traces and Thresholds Click to turn on/off display

Observed (OBS) 07/15/2025 9:00 PM MDT

Official Forecast (FCST) 07/15/2025 8:00 AM MDT

CATEGORY STAGE

Major Flooding 12 ft

Moderate Flooding 11 ft

Minor Flooding 10.5 ft

Action 10 ft

Reliability of the Forecast:

NOTE: Forecasts are issued routinely year-round.

Gauge reading affected by reservoir operations.
Auto Refresh

	CATEGORY	STAGE
	Major Flooding	12 ft
	Moderate Flooding	11 ft
	Minor Flooding	10.5 ft
	Action	10 ft

Flood Impacts 🅘

12 - This 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 - Moderate 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 - Ranchlands flood and structures begin to flood along the Blue River below Green Mountain Reservoir.

Gauge Info

Coordinates	39.8803, -106.333
RFC	CBRFC
State	CO
WFO	BOU
County	Summit
Data Provider(s)
US Geological Survey	U.S. Geological Survey
USGS	09057500

Gauge Location

Recent Crests

1.	6.02 ft	on 07-29-2021
2.	7.20 ft	on 06-02-2020
3.	8.98 ft	on 07-04-2019
4.	6.19 ft	on 08-24-2018
5.	7.32 ft	on 06-08-2017

Historic Crests

1.	10.85 ft	on 07-12-1995
2.	10.22 ft	on 07-01-1984
3.	10.13 ft	on 07-08-1957
4.	10.12 ft	on 07-11-2011
5.	9.88 ft	on 06-24-1997

Vertical Datum Table

type	NGVD29
major Flooding	7694.66 ft
moderate Flooding	7693.66 ft
minor Flooding	7693.16 ft
action	7692.66 ft
Latest Value	7687.52 ft
Gauge Zero	7682.66 ft

Gauge Photos

Photo 1 of 2

Looking Upstream

Probability Information

No Images Available

Unique Local Info

Observations provided by the U.S. Geological Survey in cooperation with Northern Water,
and the U.S. Bureau of Reclamation

Collaborative Agencies

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

Resources

Hydrologic Resource Links

Additional Resource Links

WFO Information

Weather Forecast Office

Denver/Boulder

325 Broadway

Boulder, CO 80305-3328

(303) 494-4221

Ask Questions/Webmaster

Official Homepage

1.	6.02 ft	on 07-29-2021
2.	7.20 ft	on 06-02-2020
3.	8.98 ft	on 07-04-2019
4.	6.19 ft	on 08-24-2018
5.	7.32 ft	on 06-08-2017
6.	7.42 ft	on 06-07-2016
7.	8.89 ft	on 06-21-2015
8.	8.00 ft	on 06-09-2014
9.	5.74 ft	on 08-29-2013
10.	10.12 ft	on 07-11-2011
11.	8.78 ft	on 06-10-2010
12.	9.53 ft	on 06-28-2009
13.	7.70 ft	on 07-08-2008
14.	9.15 ft	on 06-18-2007
15.	6.72 ft	on 07-12-2006
16.	7.49 ft	on 07-01-2005
17.	6.12 ft	on 10-02-2003
18.	6.15 ft	on 08-31-2001
19.	7.10 ft	on 06-21-2000
20.	7.82 ft	on 07-03-1999
21.	7.29 ft	on 05-28-1998
22.	9.88 ft	on 06-24-1997
23.	8.86 ft	on 06-20-1996
24.	10.85 ft	on 07-12-1995
25.	5.40 ft	on 08-17-1994
26.	7.01 ft	on 07-03-1993
27.	5.75 ft	on 08-21-1992
28.	5.35 ft	on 06-18-1991
29.	6.59 ft	on 08-31-1990
30.	5.93 ft	on 09-05-1989
31.	6.40 ft	on 07-01-1988
32.	6.09 ft	on 08-05-1987
33.	7.60 ft	on 06-17-1986
34.	7.46 ft	on 07-22-1985
35.	10.22 ft	on 07-01-1984
36.	9.52 ft	on 07-11-1983
37.	5.92 ft	on 07-08-1982
38.	4.96 ft	on 08-21-1981
39.	6.21 ft	on 06-16-1980
40.	7.54 ft	on 07-03-1979
41.	5.70 ft	on 07-18-1978
42.	5.55 ft	on 08-04-1977
43.	5.22 ft	on 06-29-1976
44.	6.71 ft	on 07-19-1975
45.	6.91 ft	on 06-24-1974
46.	7.71 ft	on 07-16-1973
47.	6.62 ft	on 06-24-1972
48.	7.37 ft	on 06-30-1971
49.	7.07 ft	on 06-29-1970
50.	6.69 ft	on 06-26-1969
51.	6.55 ft	on 04-01-1968
52.	7.06 ft	on 04-14-1967
53.	7.25 ft	on 04-05-1966
54.	7.07 ft	on 07-20-1965
55.	7.05 ft	on 11-06-1963
56.	7.43 ft	on 11-01-1962
57.	7.61 ft	on 06-02-1961
58.	7.26 ft	on 05-25-1960
59.	7.64 ft	on 05-15-1959
60.	7.63 ft	on 05-19-1958
61.	10.13 ft	on 07-08-1957
62.	7.36 ft	on 06-01-1956
63.	7.30 ft	on 09-07-1954
64.	7.33 ft	on 06-02-1953
65.	8.62 ft	on 06-21-1952

1.	10.85 ft	on 07-12-1995
2.	10.22 ft	on 07-01-1984
3.	10.13 ft	on 07-08-1957
4.	10.12 ft	on 07-11-2011
5.	9.88 ft	on 06-24-1997
6.	9.53 ft	on 06-28-2009
7.	9.52 ft	on 07-11-1983
8.	9.15 ft	on 06-18-2007
9.	8.98 ft	on 07-04-2019
10.	8.89 ft	on 06-21-2015
11.	8.86 ft	on 06-20-1996
12.	8.78 ft	on 06-10-2010
13.	8.62 ft	on 06-21-1952
14.	8.00 ft	on 06-09-2014
15.	7.82 ft	on 07-03-1999
16.	7.71 ft	on 07-16-1973
17.	7.70 ft	on 07-08-2008
18.	7.64 ft	on 05-15-1959
19.	7.63 ft	on 05-19-1958
20.	7.61 ft	on 06-02-1961
21.	7.60 ft	on 06-17-1986
22.	7.54 ft	on 07-03-1979
23.	7.49 ft	on 07-01-2005
24.	7.46 ft	on 07-22-1985
25.	7.43 ft	on 11-01-1962
26.	7.42 ft	on 06-07-2016
27.	7.37 ft	on 06-30-1971
28.	7.36 ft	on 06-01-1956
29.	7.33 ft	on 06-02-1953
30.	7.32 ft	on 06-08-2017
31.	7.30 ft	on 09-07-1954
32.	7.29 ft	on 05-28-1998
33.	7.26 ft	on 05-25-1960
34.	7.25 ft	on 04-05-1966
35.	7.20 ft	on 06-02-2020
36.	7.10 ft	on 06-21-2000
37.	7.07 ft	on 07-20-1965
38.	7.07 ft	on 06-29-1970
39.	7.06 ft	on 04-14-1967
40.	7.05 ft	on 11-06-1963
41.	7.01 ft	on 07-03-1993
42.	6.91 ft	on 06-24-1974
43.	6.72 ft	on 07-12-2006
44.	6.71 ft	on 07-19-1975
45.	6.69 ft	on 06-26-1969
46.	6.62 ft	on 06-24-1972
47.	6.59 ft	on 08-31-1990
48.	6.55 ft	on 04-01-1968
49.	6.40 ft	on 07-01-1988
50.	6.21 ft	on 06-16-1980
51.	6.19 ft	on 08-24-2018
52.	6.15 ft	on 08-31-2001
53.	6.12 ft	on 10-02-2003
54.	6.09 ft	on 08-05-1987
55.	6.02 ft	on 07-29-2021
56.	5.93 ft	on 09-05-1989
57.	5.92 ft	on 07-08-1982
58.	5.75 ft	on 08-21-1992
59.	5.74 ft	on 08-29-2013
60.	5.70 ft	on 07-18-1978
61.	5.55 ft	on 08-04-1977
62.	5.40 ft	on 08-17-1994
63.	5.35 ft	on 06-18-1991
64.	5.22 ft	on 06-29-1976
65.	4.96 ft	on 08-21-1981