Crow Lane No. 1 dam
Crow Lane No. 1
Crow Lane No. 1 is a key water supply structure located in Lyons, Colorado, designed by McLaughlin Water Engineers, Ltd. Completed in 2008, this Earth-type dam stands at a height of 40 feet and has a hydraulic height of 35 feet, with a total structural height of 74 feet. It serves the primary purpose of water supply and has a storage capacity of 52 acre-feet, with a maximum discharge rate of 6052 cubic feet per second.
With a spillway width of 229 feet and a high hazard potential, Crow Lane No. 1 is regulated by the Colorado Department of Water Resources and undergoes regular inspections to ensure its satisfactory condition. The surrounding area includes an unnamed tributary of the Thompson-Os river, making this dam a crucial asset for water management in the region. Despite its moderate risk assessment, the structure meets guidelines for emergency action plans and risk management measures.
Crow Lane No. 1 represents a vital piece of water infrastructure in Larimer County, serving as a reliable source for water supply in the area. Its strategic location and design make it an essential component in the sustainable management of water resources amidst evolving climate conditions. As climate enthusiasts and water resource experts, monitoring and maintaining structures like Crow Lane No. 1 are crucial for ensuring the resilience and safety of our water supply systems in the face of changing environmental challenges.
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 Crow Lane No. 1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| St. Vrain Creek At Lyons | 89 cfs | → |
| Left Hand Creek Near Boulder | 36 cfs | → |
| Buckhorn Creek Near Masonville | 21 cfs | → |
| South St. Vrain Creek Near Ward | 37 cfs | → |
| Left Hand Creek At Hover Road Near Longmont | 1 cfs | → |
| Big Thompson River At Loveland | 80 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Crow Lane No. 1.
Boat launches
- Lagerman Trail Boulder County
- Boat Ramp Larimer County
- Miramonte Road Boulder County
- Boat Launch Grand Lake
- Hilltop Boating Site
- Grand County
Campgrounds
- Meadow Park
- Hermit Park Open Space
- Pole Hill Road Dispersed Camping
- Pinewood Reservoir
- Carter Lake - South Side Campgrounds
- North Pine Campground
Fishing spots
- Ralph Price Reservoir (Button Rock)
- South Saint Vrain Fishing Site #2
- South Saint Vrain Fishing Site #4
- Pinewood Reservoir
- South Saint Vrain Fishing Site #5
- Carter Lake
Paddle runs
Track Crow Lane No. 1 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 Crow Lane No. 1
Where does the data for Crow Lane No. 1 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 High 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 Crow Lane No. 1.