Blackmer #1 is an earth dam located in Arapahoe County, Colorado, built in 1936. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 12 ft12 ft tall and 488 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Blackmer #1
The primary purpose of Blackmer #1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Kent Denver Country Day School (nelson, Dave) (private). It impounds the South Platte River-tr near Englewood.
The dam stands 12 feet tall and stretches 488 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 69 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1936, the structure is well-established, with more than 75 years of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 10/06/2016. That was over 10 years ago.
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Location
| State | Colorado |
| County | Arapahoe |
| Nearest City | Englewood |
| River/Stream | South Platte River-tr |
| Coordinates | 39.63167, -104.93722 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 488 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 69 acre-ft |
| Max Storage | 69 acre-ft |
| Normal Storage | 37 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 2,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Kent Denver Country Day School (nelson, Dave) |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/06/2016 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CO00263 |
| Federal ID | CO00263 |
| More Info | State Dam Safety Program |