West Sunnyside Watershed Site C-4 dam
West Sunnyside Watershed Site C-4
West Sunnyside Watershed Site C-4 is a crucial water resource located in Plymouth County, Iowa, specifically in the city of Sioux City. This site, managed by the local government, serves multiple purposes including fire protection, stock, and small fish pond management, as well as flood risk reduction. Constructed in 1973 by the USDA NRCS, this Earth-type dam stands at 52 feet tall and spans 456 feet in length, with a storage capacity of 115 acre-feet and a drainage area of 0.52 square miles.
Despite being classified as having a low hazard potential, West Sunnyside Watershed Site C-4 is subject to state regulation, inspection, and enforcement by the Iowa Department of Natural Resources. The dam has not been rated for its condition assessment, but its risk assessment is moderate. With a surface area of 6.1 acres and a normal storage capacity of 79 acre-feet, this site plays a critical role in water management and safety in the region. Its location near TR-Broken Kettle Creek highlights its importance in flood risk reduction efforts.
Overall, West Sunnyside Watershed Site C-4 is a significant water resource infrastructure that contributes to the overall water management and safety in the Plymouth County area. With its multiple purposes and regulatory oversight, this site showcases the importance of sustainable and effective water resource management practices in mitigating flood risks and ensuring 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 West Sunnyside Watershed Site C-4 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Perry Creek Near Milnerville | 25 cfs | → |
| Big Sioux River At Akron | 1,120 cfs | → |
| Floyd River At James | 332 cfs | → |
| Missouri River At Sioux City | 26,300 cfs | → |
| Vermillion River Nr Vermillion Sd | 42 cfs | → |
| Omaha Cr At Homer | 30 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near West Sunnyside Watershed Site C-4.
Boat launches
- 220th Street Plymouth County
- 180th Street Plymouth County
- State Highway 3 Plymouth County
- Ponca
- Scenic Park S Sioux City
- Bacon Creek Sioux City
Track West Sunnyside Watershed Site C-4 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 West Sunnyside Watershed Site C-4
Where does the data for West Sunnyside Watershed Site C-4 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 West Sunnyside Watershed Site C-4.