Gregory Dam 4147 dam
Gregory Dam 4147
Gregory Dam 4147, located in Sarpy, Nebraska, plays a crucial role in flood risk reduction along the TR-Elkhorn River. Built in 1960, this privately owned earth dam stands at a height of 22.2 feet and has a length of 715 feet, providing a storage capacity of 70.7 acre-feet. Despite its low hazard potential, the dam's condition has been assessed as poor, highlighting the need for regular inspections and maintenance to ensure its continued effectiveness in mitigating flood risks in the region.
Managed by the Nebraska Department of Natural Resources, Gregory Dam 4147 is subject to state regulation, inspection, and enforcement. Although it has not undergone any modifications in recent years, the dam's maintenance and emergency preparedness measures should be closely monitored to address the identified condition concerns. Additionally, its location within Congressional District 02, Nebraska, under the representation of Don Bacon (R), emphasizes the importance of collaboration and support from federal and local stakeholders in safeguarding the surrounding communities from potential flooding events.
With a primary purpose of flood risk reduction, Gregory Dam 4147 serves as a critical infrastructure within the Kansas City District of the US Army Corps of Engineers. As water resource and climate enthusiasts, it is essential to recognize the vital role that dams like Gregory Dam 4147 play in protecting lives and property from the impacts of extreme weather events. By staying informed about the dam's condition, maintenance efforts, and emergency response plans, stakeholders can contribute to the resilience of the region's water infrastructure and enhance its ability to adapt to 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 Gregory Dam 4147 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Platte R Nr Ashland | 2,650 cfs | → |
| Wahoo Cr At Ashland | 80 cfs | → |
| Elkhorn River At Waterloo | 1,030 cfs | → |
| Platte R At Louisville Ne | 4,040 cfs | → |
| Platte River Nr Leshara | 1,750 cfs | → |
| Big Papillion Cr | 38 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Gregory Dam 4147.
Boat launches
- Chalco Hills Recreation Area
- Main Boat Ramp
- Graske Crossing Boat Ramp
- Prairie Queen
- Waterloo River Access
Track Gregory Dam 4147 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 Gregory Dam 4147
Where does the data for Gregory Dam 4147 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 Gregory Dam 4147.