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Hydrograph River at a Glance Download
Big Thompson River (CO) at above the Canyon Mouth at Cedar Cove Stage (ft)Observed: 4.24 ft at 10:46PM Feb 17, 2018Observed: 4.24 ft at 11:01PM Feb 17, 2018Observed: 4.22 ft at 11:16PM Feb 17, 2018Observed: 4.19 ft at 10:47AM Feb 18, 2018Observed: 4.14 ft at 11:02AM Feb 18, 2018Observed: 4.24 ft at 11:17AM Feb 18, 2018Observed: 4.05 ft at 10:46PM Feb 18, 2018Observed: 4.04 ft at 11:01PM Feb 18, 2018Observed: 4.04 ft at 11:16PM Feb 18, 2018Observed: 4.06 ft at 10:46AM Feb 19, 2018Observed: 4.05 ft at 11:01AM Feb 19, 2018Observed: 4.04 ft at 11:16AM Feb 19, 2018Observed: 4.36 ft at 10:46PM Feb 19, 2018Observed: 4.26 ft at 11:01PM Feb 19, 2018Observed: 4.37 ft at 11:16PM Feb 19, 2018Observed: 4.42 ft at 10:46AM Feb 20, 2018Observed: 4.42 ft at 11:01AM Feb 20, 2018Observed: 4.39 ft at 11:16AM Feb 20, 2018Observed: 3.9 ft at 11:01PM Feb 20, 2018Observed: 3.9 ft at 11:16PM Feb 20, 2018Observed: 4.14 ft at 11:31PM Feb 20, 2018Observed: 4.39 ft at 11:01AM Feb 21, 2018Observed: 4.47 ft at 11:16AM Feb 21, 2018Observed: 4.44 ft at 11:31AM Feb 21, 2018Observed: 4.52 ft at 11:01PM Feb 21, 2018Observed: 4.52 ft at 11:16PM Feb 21, 2018Observed: 4.52 ft at 11:31PM Feb 21, 2018Observed: 4.49 ft at 11:01AM Feb 22, 2018Observed: 4.51 ft at 11:16AM Feb 22, 2018Observed: 4.52 ft at 11:31AM Feb 22, 2018Observed: 4.45 ft at 11:01PM Feb 22, 2018Observed: 4.46 ft at 11:16PM Feb 22, 2018Observed: 4.46 ft at 11:31PM Feb 22, 2018Highest Observation: 4.63 ft at 11:01AM Feb 23, 2018Highest Observation: 4.63 ft at 11:16AM Feb 23, 2018Observed: 4.6 ft at 11:31AM Feb 23, 2018Colorado Division of Water ResourcesBIMC2(plotting HGIRG) Graph Created (9:15PM Feb 23, 2018)ObservedLatest observed value: 4.6 ft at 11:31 AM MST 23-Feb-2018. Flood Stage is 7.5 ft
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Tabular Data (UTC)
Tabular Data (MST)
XML Data
RSS Files
Datum: NGVD29
NOTE: Gauge reading affected by reservoir operations.

NOTE: Gauge reading may be affected by ice during freezing weather from November to April.

NOTE: Forecasts for the Big Thompson River (CO) at above the Canyon Mouth at Cedar Cove are issued as needed during times of high water, but are not routinely available.

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Upstream Locations Upstream Gauge Downstream Gauge Downstream Gauge - at Loveland
Flood Categories (in feet)
Major Flood Stage: 11
Moderate Flood Stage: 9
Flood Stage: 7.5
Action Stage: 6.5
Low Stage (in feet): -9999

Historic Crests
(1) 6.43 ft on 05/31/2014
(2) 5.96 ft on 06/11/2015
(3) 5.65 ft on 06/23/2016

(P): Preliminary values subject to further review.

Recent Crests
(1) 5.65 ft on 06/23/2016
(2) 5.96 ft on 06/11/2015
(3) 6.43 ft on 05/31/2014

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:10
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Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
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12.5 This is a major, life threatening flood. There is extensive inundation of houses and severe damage to Highway 34 in Big Thompson Canyon.
11 This is a major, life threatening flood with extensive flooding and damage to Highway 34 in Big Thompson Canyon.
9 A number of private bridges crossing the Big Thompson River flood.
8.5 Water floods several houses west of Marianna Butte. Sylvan Dale Ranch near Cedar Cove is flooded.
7.5 Houses flood west of the Highway 31D Bridge off of County Road 22H.
7 Water spills into the Riverview Campground.
6.5 Water flows into low lying areas along the river near Cedar Cove.
(1) Looking Upstream
(2) Looking Downstream
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Latitude: 40.414900° N, Longitude: 105.251000° W, Horizontal Datum: NAD27

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 7.5 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 5305.47 5311.47 Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  
Additional Information Collapse
Stream level observations provided by the Colorado Division of Water Resources
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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.
NWS Information
National Weather Service
Denver/Boulder Weather Forecast Office
325 Broadway
Boulder, CO 80305-3328
(303) 494-4221
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Page last modified: 21-Dec-2016 5:19 PM
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