South Fork 3-D dam
South Fork 3-D
South Fork 3-D is a significant earth dam located in Pawnee, Nebraska, designed by the USDA NRCS and completed in 1981. This dam serves a primary purpose of flood risk reduction and stands at a height of 31 feet, with a structural height of 36 feet. It has a storage capacity of 767 acre-feet and covers a surface area of 30 acres, with a drainage area of 1.9 square miles.
Managed by the Nebraska Department of Natural Resources, South Fork 3-D is regulated, permitted, inspected, and enforced to ensure its safe operation and maintenance. The dam has a low hazard potential and is currently in satisfactory condition, last assessed in 2017. Despite its age, South Fork 3-D continues to play a crucial role in mitigating flood risks in the region, with a maximum discharge capacity of 374 cubic feet per second.
Enthusiasts of water resources and climate will appreciate the engineering and hydrological details of South Fork 3-D, located along the TR-NEGRO BRANCH CREEK. With its historical significance and ongoing regulatory oversight, this dam exemplifies the importance of infrastructure in managing water resources and mitigating the impacts of extreme weather events in Nebraska.
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 South Fork 3-D -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Turkey C Nr Seneca | 147 cfs | → |
| North Fork Big Nemaha River At Humboldt | 850 cfs | → |
| Big Blue R At Barneston Nebr | 2,280 cfs | → |
| Big Nemaha River At Falls City | 1,470 cfs | → |
| Black Vermillion R Nr Frankfort | 174 cfs | → |
| Little Nemaha River At Auburn | 743 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near South Fork 3-D.
Boat launches
- Iron Horse Trail Lake
- Kirkmans Cove Lake
- Burchard Lake Wma
- Pony Creek Boat Ramp
- Wolf - Wildcat
- Rockford Lake Sra
Track South Fork 3-D 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 South Fork 3-D
Where does the data for South Fork 3-D 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 South Fork 3-D.