Jann Jensen Dam dam
Jann Jensen Dam
Jann Jensen Dam, located in Emerald, Nebraska, is a crucial water resource infrastructure managed by the local government. Built in 1960 by USDA NRCS, this earth dam stands at a height of 28 feet with a length of 250 feet, providing flood risk reduction and other purposes for the Middle Creek watershed. With a storage capacity of 65.1 acre-feet and a drainage area of 0.48 square miles, the dam plays a vital role in water management and protection in the region.
The dam, regulated by the Nebraska Department of Natural Resources, has a low hazard potential and is currently in a not-rated condition as of the last assessment in 2017. Despite not having a spillway, the dam's design and construction using stone core and soil foundation have ensured its structural integrity over the years. With its location in Seward County, Nebraska, the Jann Jensen Dam serves as a key component in the local water infrastructure, contributing to the overall water security and management strategies in the area.
Ensuring the safety and integrity of the Jann Jensen Dam is a top priority for the local government, with regular inspections carried out every five years to assess its condition and maintenance needs. While the dam has not been modified since its completion, its emergency action plan and risk management measures are continuously evaluated to meet guidelines and ensure preparedness for any potential incidents. As a significant asset in the region's water resource system, the Jann Jensen Dam symbolizes the importance of sustainable water infrastructure for climate resilience and community safety.
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 Jann Jensen Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Oak Creek At Air Park Rd At Lincoln | 23 cfs | → |
| Middle Creek At Sw 40th St. At Lincoln | 1 cfs | → |
| Haines Branch At Sw 56th St. At Lincoln | 11 cfs | → |
| Little Salt Creek Near Lincoln | 5 cfs | → |
| Salt Creek At Lincoln | 99 cfs | → |
| Salt Creek At Pioneers Blvd At Lincoln | 9 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Jann Jensen Dam.
Boat launches
Track Jann Jensen Dam 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 Jann Jensen Dam
Where does the data for Jann Jensen Dam 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 Low 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 Jann Jensen Dam.