Nissen #2
Nissen #2 is an earth dam located in Broomfield County, Colorado, built in 1974. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Nissen #2
The primary purpose of Nissen #2 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Eagle Trace Golf Club (private). It impounds the Big Dry Creek-os near Broomfield.
The dam stands 9 feet tall and stretches 2,300 feet across, creates a reservoir covering 29 acres, and has a maximum storage capacity of 291 acre-feet. Completed in 1974, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. 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 05/18/2022.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Colorado dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Colorado |
| County | Broomfield |
| Nearest City | Broomfield |
| River/Stream | Big Dry Creek-os |
| Coordinates | 39.93515, -105.06854 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 9 ft |
| Dam Height | 6 ft |
| Dam Length | 2,300 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 291 acre-ft |
| Max Storage | 291 acre-ft |
| Normal Storage | 154 acre-ft |
| Surface Area | 29 acres |
| Max Discharge | 1,005 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | EAGLE TRACE GOLF CLUB |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/18/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO02128 |
| Federal ID | CO02128 |
| More Info | State Dam Safety Program |