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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: The National Hydrologic Discussion, Area Hydrologic Discussion, and Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via, as described in the StoryMap here.

Hydrograph River at a Glance Download
Big Thompson River (CO) at Lake Estes Inflow Discharge (cfs)Highest Forecast: 821 cfs 6:00AM Jun 05, 2023Forecast: 763 cfs 12:00PM Jun 05, 2023Forecast: 706 cfs 6:00PM Jun 05, 2023Forecast: 670 cfs 12:00AM Jun 06, 2023Forecast: 645 cfs 6:00AM Jun 06, 2023Forecast: 615 cfs 12:00PM Jun 06, 2023Forecast: 589 cfs 6:00PM Jun 06, 2023Forecast: 581 cfs 12:00AM Jun 07, 2023Forecast: 581 cfs 6:00AM Jun 07, 2023Forecast: 569 cfs 12:00PM Jun 07, 2023Forecast: 556 cfs 6:00PM Jun 07, 2023Forecast: 552 cfs 12:00AM Jun 08, 2023Forecast: 551 cfs 6:00AM Jun 08, 2023Forecast: 541 cfs 12:00PM Jun 08, 2023Forecast: 527 cfs 6:00PM Jun 08, 2023Forecast: 520 cfs 12:00AM Jun 09, 2023Forecast: 517 cfs 6:00AM Jun 09, 2023ESSC2(plotting QIIRZ) Graph Created (1:45AM Jun 5, 2023)Forecast (issued 7:34AM Jun 4)
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About this graph
Tabular Data (UTC)
Tabular Data (MDT)
XML Data
RSS Files
Datum: NGVD29
NOTE: Forecasts for the Big Thompson River (CO) at Lake Estes are issued routinely year-round.
Return to Area Map
Downstream Gauge Downstream Gauge - below Lake Estes
Flood Categories (in KCFS)
Major Flood Flow: 0
Moderate Flood Flow: 0
Flood Flow: 0
Action Flow: 1.15
Low Stage (in feet): -9999

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:13
KML Image
Gauge LocationGauge Map Marker
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.
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If you notice any errors in the below information, please contact our Webmaster
1150 The river is bankfull in Estes Park.
About This Location Collapse

Latitude: 40.375600° N, Longitude: 105.487800° W, Horizontal Datum: NAD27

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS flow Not Available Not Available 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 7492 Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  
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Hydrologic Resources Additional 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: 2-Nov-2020 7:28 PM
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