Grant B is an earth dam located in Jefferson County, Colorado, built in 1910. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 19 ft19 ft tall and 1,200 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 Grant B
The primary purpose of Grant B is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Simonson & Associates (simonson, Judy) (private). It impounds the S Platte R-tr near Bowmar.
The dam stands 19 feet tall and stretches 1,200 feet across, creates a reservoir covering 27 acres, and has a maximum storage capacity of 250 acre-feet. Completed in 1910, the structure is over a century old.
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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 04/08/2016. That was over 10 years ago.
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Location
| State | Colorado |
| County | Jefferson |
| Nearest City | Bowmar |
| River/Stream | S Platte R-tr |
| Coordinates | 39.61362, -105.08075 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 1,200 ft |
| Year Completed | 1910 (116 years old) |
Storage & Hydraulics
| NID Storage | 250 acre-ft |
| Max Storage | 250 acre-ft |
| Normal Storage | 130 acre-ft |
| Surface Area | 27 acres |
| Max Discharge | 1,052 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Simonson & Associates (simonson, Judy) |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 04/08/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO01818 |
| Federal ID | CO01818 |
| More Info | State Dam Safety Program |