Granby Reservoir reservoir
Granby Reservoir
Granby Reservoir is a man-made lake located in Grand County, Colorado. The reservoir was created in 1950 when the Granby Dam was constructed across the Colorado River. The primary purpose of the reservoir is to provide water for irrigation, municipal, and industrial uses. The hydrology of the reservoir is dominated by snowmelt, and the surface flow is primarily from the Fraser River and other tributaries. The snowpack providers for the area include the Rocky Mountains, which are a primary source of snow and rainfall. The reservoir also supports recreational activities like fishing, boating, and camping. In recent years, the reservoir has experienced some challenges due to drought and low snowpack levels, which have impacted agricultural and recreational activities.
Daily levels at Granby Reservoir
Storage volume, pool elevation, and total release plotted from the operating agency's daily observations.
Storage
acre-ft · code 17
Inflow
cfs · code 29
Pool Elevation
ft · code 49
Total Release
cfs · code 42
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Granby Reservoir -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Colorado River Below Lake Granby | 124 cfs | → |
| Colorado River Near Granby | 91 cfs | → |
| Colorado River Bl Shadow Mountain Reservoir | 50 cfs | → |
| Willow Creek Below Willow Creek Reservoir | 7 cfs | → |
| Grand Lake Outlet Blw Chipmunk Ln At Grand Lk | 193 cfs | → |
| Colorado River At Windy Gap | 149 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Granby Reservoir.
Boat launches
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Campgrounds
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Fishing spots
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River runs
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About Granby Reservoir
Where does the data for Granby Reservoir come from?
Daily storage, pool elevation, and release rates are sourced from USGS, USBR, and USACE monitoring stations. Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
Storage observations are updated daily by the operating agency. The 15-day weather forecast refreshes throughout the day. Snoflo caches and renders the most recent observation -- check the "as of" timestamp on the storage card.
What does the Hazard hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card below for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this reservoir, set a threshold, and you'll get a push the moment conditions cross.