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Alamosa River above Terrace Reservoir

Highest listed crest 11.00 ftFlood stage 7.0 ft13 crests since 1911

The Alamosa River above Terrace Reservoir crested above flood stage 1 time among the 13 crests the National Weather Service lists from 1911 to 2019. The highest, 11.00 ft on October 5, 1911, was minor flooding, 4.00 feet above flood stage.

The gauge

Highest listed crest
11.00 ft
October 5, 1911; 5,200 cubic feet per second
Flood stage
7.0 ft
No major stage set
Crests at major
0
1 above flood stage
Most recent flood crest
October 5, 1911
11.00 ft, minor flooding
Location
Conejos County
Colorado

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Alamosa River above Terrace Reservoir
Action stage6.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)7.01Oct 5, 1911Minimal or no property damage, but possibly some public threat

Every listed crest

13 crests from 1911 to 2019. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Alamosa River above Terrace Reservoir, 1911 to 2019 24681012ft Flood stage 7.0 ft Oct 5, 1911: 11.00 ft, minor flooding; 5,200 cubic feet per secondJun 29, 1927: 3.00 ft, below flood stage; 1,940 cubic feet per secondJun 15, 1935: 4.20 ft, below flood stage; 1,990 cubic feet per secondMay 28, 1938: 4.09 ft, below flood stage; 1,630 cubic feet per secondMay 13, 1941: 4.20 ft, below flood stage; 1,800 cubic feet per secondJun 3, 1948: 4.09 ft, below flood stage; 1,650 cubic feet per secondJun 17, 1949: 4.07 ft, below flood stage; 1,630 cubic feet per secondJun 10, 1952: 4.12 ft, below flood stage; 1,680 cubic feet per secondJun 21, 1957: 4.24 ft, below flood stage; 1,950 cubic feet per secondJun 19, 1965: 3.50 ft, below flood stage; 1,510 cubic feet per secondJun 12, 1973: 3.58 ft, below flood stage; 1,590 cubic feet per secondMay 23, 2005: 3.88 ft, below flood stage; 1,600 cubic feet per secondJun 9, 2019: 3.72 ft, below flood stage; 1,460 cubic feet per second Highest, 11.00 ft, Oct 5, 1911 192019401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Alamosa River above Terrace Reservoir 1910s: 1 1 1920s: 0 1930s: 0 1940s: 0 1950s: 0 1960s: 0 1970s: 0 1980s: 0 1990s: 0 2000s: 0 2010s: 0 1910s1920s1930s1940s1950s1960s1970s1980s1990s2000s2010s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Alamosa River above Terrace Reservoir
1Oct 5, 191111.00+4.00Minor5,200
2Jun 21, 19574.24−2.76Below flood stage1,950
3Jun 15, 19354.20−2.80Below flood stage1,990
4May 13, 19414.20−2.80Below flood stage1,800
5Jun 10, 19524.12−2.88Below flood stage1,680
6May 28, 19384.09−2.91Below flood stage1,630
7Jun 3, 19484.09−2.91Below flood stage1,650
8Jun 17, 19494.07−2.93Below flood stage1,630
9May 23, 20053.88−3.12Below flood stage1,600
10Jun 9, 20193.72−3.28Below flood stage1,460
11Jun 12, 19733.58−3.42Below flood stage1,590
12Jun 19, 19653.50−3.50Below flood stage1,510
13Jun 29, 19273.00−4.00Below flood stage1,940

Other gauges in Conejos County

Flood gauges in Conejos County
Mogote6.08.50 ft, Oct 5, 19111
Lobatos9.010.00 ft, Jun 18, 19030

Conejos County: every hazard · River floods across the country · Colorado

NOAA National Water Prediction Service, gauge TERC2, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.