Flannery dam
Flannery
Flannery, located in Glenwood Springs, Colorado, is a private dam built in 1990 with a primary purpose of serving as a Fish and Wildlife Pond. This Earth dam, standing at 15 feet high with a hydraulic height of 13 feet, has a storage capacity of 203 acre-feet and covers a surface area of 24 acres. The dam, constructed by HIGH COUNTRY ENGINEERS, is regulated by the Colorado Department of Water Resources and undergoes regular inspections to ensure its fair condition and significant hazard potential.
Situated on Threemile Creek, Flannery plays a crucial role in providing water for fire protection, stock, irrigation, and wildlife in the surrounding area. The dam's spillway, with a width of 13 feet, is uncontrolled, allowing excess water to safely flow downstream. Despite being a man-made structure, Flannery blends into its natural surroundings with a core made of stone and foundations resting on rock and soil. The dam's two slide gates serve as outlets to manage water levels and maintain the pond's ecological balance.
Flannery's moderate risk assessment indicates a need for ongoing risk management measures to ensure the safety and integrity of the structure. With its strategic location and vital role in water resource management, Flannery stands as a testament to human ingenuity in balancing the needs of wildlife, agriculture, and emergency preparedness in a changing climate.
Dam data reference
Condition Assessment
- Satisfactory
- No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
- Fair
- No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action.
- Poor
- A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency.
- Unsatisfactory
- A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
- Not Rated
- The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Hazard Potential Classification
- High
- Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
- Significant
- Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environmental damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
- Low
- Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
- Undetermined
- Dams for which a downstream hazard potential has not been designated or is not provided.
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 Flannery -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Roaring Fork River At Glenwood Springs | 1,310 cfs | → |
| Colorado River Below Glenwood Springs | 3,130 cfs | → |
| West Divide Creek Near Raven | 50 cfs | → |
| Roaring Fork River Near Emma | 542 cfs | → |
| Crystal River Ab Avalanche C | 853 cfs | → |
| Colorado River Near Dotsero | 1,240 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Flannery.
Boat launches
- South Canyon Boat Ramp
- I 70 Garfield County
- Grizzly Creek Garfield County
- New Castle
- Wingo Boat Ramp
- Dotsero Landing Boat Ramp
Campgrounds
- Thompson Creek Camp
- Lower Prince Creek Campground
- Upper Prince Creek Campground
- Tiki Mine Camp
- Coffee Pot Spring
- Avalanche
Fishing spots
- Christine Lake
- Harvey Gap Reservoir
- Fryingpan River
- Deep Lake Fishing/Picnic Area Fishing Site
- Rifle Gap Reservoir
- Meadow Creek Lake
Track Flannery in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Flannery
Where does the data for Flannery come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Significant 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 above 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 dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Flannery.