Allis
Key Takeaway
Allis is classified as low hazard in Colorado. It was completed in 1906 and is 120 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 45 ft (taller than 85.3% in CO) |
| Dam Length | 690 ft |
| Dam Type | Earth |
| Max Storage | 225 acre-ft |
| Normal Storage | 140 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 4,100 cfs |
| Year Completed | 1906 (120 years old) |
| NID ID | CO01168 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
SILVER SPUR RANCHES
Private
Nearby Dams
Woodmoor C. C. #4
El Paso, CO
Low Hazard 28 ftWoodmoor Lake
El Paso, CO
High Hazard 58 ftW. Cherry Creek Det. #1
El Paso, CO
Low Hazard 32 ftMonument Lake
El Paso, CO
Significant Hazard 47 ftStillwater
Douglas, CO
Low Hazard 27 ftW. Cherry Creek Det. #2
El Paso, CO
Low Hazard 25 ftGreenland L&C Stockwater
Douglas, CO
Low Hazard 18 ftBristlecone
El Paso, CO
Significant Hazard 72 ftFrequently Asked Questions
What is the hazard classification of Allis?
Allis is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Allis?
Allis is owned by SILVER SPUR RANCHES (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Allis built?
Allis was completed in 1906, making it 120 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Allis?
Allis serves the following purposes: Irrigation, Fire Protection, Stock, Or Small Fish Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Allis?
Allis has a dam height of 45 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Allis last inspected?
Allis was last inspected on October 18, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.