Jett Subwatershed Site 16-1 dam
Jett Subwatershed Site 16-1
Jett Subwatershed Site 16-1, located in Woodbury County, Iowa, is a dam designed by the USDA NRCS for multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. Completed in 1966, this earth dam stands at a height of 36 feet with a length of 447 feet and a storage capacity of 46 acre-feet. The dam serves the community of Rolly Springs and is regulated by the Iowa DNR, with state permitting, inspection, and enforcement in place to ensure its safety and functionality.
With a low hazard potential and a moderate risk assessment rating, Jett Subwatershed Site 16-1 is a vital infrastructure for water resource management in the area. The dam's primary purpose and design make it a key asset for fire protection, stock watering, and flood management. Despite its age, the dam's condition remains unrated, indicating the need for ongoing monitoring and maintenance to uphold its structural integrity and operational effectiveness. The dam's location on the TR-West Fork Little Sioux river adds to its significance in managing water resources and supporting the local ecosystem.
As an essential part of the local government's infrastructure, Jett Subwatershed Site 16-1 plays a crucial role in water management and climate resilience efforts in Woodbury County, Iowa. With its regulated status and multiple purposes, including flood risk reduction, the dam contributes to the community's safety and water resource sustainability. As water resource and climate enthusiasts, understanding the importance of structures like Jett Subwatershed Site 16-1 is key to advocating for responsible water management practices and ensuring the resilience of our natural environment in the face of changing climate conditions.
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 Jett Subwatershed Site 16-1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Little Sioux River At Correctionville | 1,400 cfs | → |
| West Fork Ditch At Hornick | 80 cfs | → |
| Maple River At Mapleton | 264 cfs | → |
| Floyd River At James | 323 cfs | → |
| Missouri River At Sioux City | 26,000 cfs | → |
| Omaha Cr At Homer | 31 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Jett Subwatershed Site 16-1.
Boat launches
Campgrounds
Track Jett Subwatershed Site 16-1 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 Jett Subwatershed Site 16-1
Where does the data for Jett Subwatershed Site 16-1 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 Jett Subwatershed Site 16-1.