Mcintosh
Mcintosh is an earth dam located in Boulder County, Colorado, built in 1902. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Mcintosh
The primary purpose of Mcintosh is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Lake Mcintosh Reservoir Company (wade Gonzales) (private). It impounds the St. Vrain Creek-os near Longmont.
The dam stands 17 feet tall and stretches 2,350 feet across, creates a reservoir covering 263 acres, has a maximum storage capacity of 3,352 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1902, the structure is over a century old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 08/31/2022.
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Location
| State | Colorado |
| County | Boulder |
| Nearest City | Longmont |
| River/Stream | St. Vrain Creek-os |
| Coordinates | 40.19126, -105.15674 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 2,350 ft |
| Year Completed | 1902 (124 years old) |
Storage & Hydraulics
| NID Storage | 3,352 acre-ft |
| Max Storage | 3,352 acre-ft |
| Normal Storage | 2,460 acre-ft |
| Surface Area | 263 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 6,354 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | LAKE MCINTOSH RESERVOIR COMPANY (WADE GONZALES) |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/31/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO01229 |
| Federal ID | CO01229 |
| More Info | State Dam Safety Program |