Allis dam
Allis
Allis is a privately owned dam located in Castle Rock, Colorado, constructed in 1906 for irrigation purposes along Carpenter Creek. Standing at 45 feet high and stretching 690 feet in length, the dam has a storage capacity of 225 acre-feet, with a normal storage of 140 acre-feet and a surface area of 12 acres. With a low hazard potential and a moderate risk assessment, the dam is classified as unsatisfactory in condition as of the last inspection in 2013.
Despite its age, Allis continues to serve its primary purpose of irrigation along with providing fire protection, stock, and small fish pond services. The dam's uncontrolled spillway width of 12 feet allows for a maximum discharge of 4100 cubic feet per second. The dam is under state jurisdiction and regulated by the Colorado Department of Water Resources, with permitting, inspections, and enforcement regularly conducted to ensure its safety and compliance.
Located in Douglas County, Allis plays a crucial role in water resource management in the region. While classified as having a moderate risk assessment, the dam's low hazard potential indicates a manageable level of risk. With its rich history dating back over a century, Allis stands as a testament to the importance of maintaining and regulating water infrastructure for both agricultural and environmental purposes in the face of changing climate patterns.
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 Allis -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Monument Creek At Palmer Lake | 1 cfs | → |
| Monument C Ab N.Gate Blvd At Usaf Academy | 7 cfs | → |
| West Monument Creek At Air Force Academy | 3 cfs | → |
| Pine Creek Abv Briargate Pkwy | 3 cfs | → |
| West Monument Creek Below Rampart Reservoir | 4 cfs | → |
| Monument Cr Abv Woodmen Rd At Colorado Springs | 16 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Allis.
Campgrounds
- Peregrine Pines Military - Usaf Academy
- Peregrine Pines Family Camp
- 21
- Farish Military - Usaf Academy
- 22
- 23
Fishing spots
- Palmer Lake
- Monument Lake (El Paso County)
- Upper Reservoir - Palmer Lake
- Deadmans Creek
- Nichols Reservoir
- Rampart Reservoir
Track Allis 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 Allis
Where does the data for Allis 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 Low 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 Allis.