Nissen #2 dam
Nissen #2
Nissen #2 is a privately owned earth dam located in Broomfield, Colorado, with a primary purpose of irrigation. Completed in 1974, this dam stands at a height of 9 feet and has a length of 2300 feet, providing a storage capacity of 291 acre-feet. Situated on Big Dry Creek-OS, this dam has a spillway width of 160 feet and a maximum discharge of 1005 cubic feet per second, making it a crucial structure for managing water resources in the area.
With a high hazard potential but a satisfactory condition assessment as of December 2020, Nissen #2 is regularly inspected by the state regulatory agency to ensure its safety and compliance with regulations. The dam's risk assessment categorizes it as moderate, prompting the need for ongoing risk management measures. The presence of this dam plays a vital role in supporting irrigation activities in the region, highlighting the importance of water infrastructure for agricultural sustainability and climate resilience in Colorado.
As water resource and climate enthusiasts, understanding the significance of structures like Nissen #2 is crucial for ensuring the sustainable management of water systems in the face of changing environmental conditions. By monitoring and maintaining dams like Nissen #2, stakeholders can work towards enhancing water security and resilience in the region, ultimately contributing to the long-term sustainability of Colorado's water resources in a changing climate.
Dam data reference
Condition Assessment
- Satisfactory
- No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
- Fair
- No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action.
- Poor
- A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency.
- Unsatisfactory
- A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
- Not Rated
- The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Hazard Potential Classification
- High
- Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
- Significant
- Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environmental damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
- Low
- Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
- Undetermined
- Dams for which a downstream hazard potential has not been designated or is not provided.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Nissen #2 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Big Dry Creek At Westminster | 1 cfs | → |
| Little Dry Creek At Westminster | 1 cfs | → |
| Clear Creek At Mouth | 13 cfs | → |
| Boulder Cr At North 75th St Nr Boulder | 37 cfs | → |
| South Platte R At 64th Ave. Commerce City | 96 cfs | → |
| South Platte River At Henderson | 190 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Nissen #2.
Boat launches
- Standley Lake Trail Westminster
- West 69th Avenue 4700, Westminster
- Ralston Creek Trail Arvada
- Lagerman Trail Boulder County
- Miramonte Road Boulder County
- Brighton
Campgrounds
- Tipi Village
- Standley Lake
- Camp Patiya
- Clear Creek Rv Park
- Boulder County Fairground
- St. Vrain State Park
Fishing spots
- Tom Frost Reservoir
- Stearns Lake
- Loc Amora Pond (Josh`S Pond)
- Community College Pond
- Mckay Lake
- Westminster City Park Pond
Track Nissen #2 in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Nissen #2
Where does the data for Nissen #2 come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the High hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Nissen #2.