Ash Hollow Dry Dam dam
Ash Hollow Dry Dam
Ash Hollow Dry Dam, located in Waverly, Nebraska, is a vital flood risk reduction structure designed by Olsson Associates and completed in 2017. The dam stands at a height of 33 feet and has a hydraulic height of 31.81 feet, providing protection for the surrounding area along Ash Hollow Creek. With a storage capacity of 1744.4 acre-feet and a drainage area of 2.88 square miles, the dam plays a crucial role in mitigating the impact of potential flooding events in the region.
Managed by the local government and regulated by the Nebraska Department of Natural Resources, Ash Hollow Dry Dam is inspected regularly to ensure its satisfactory condition and high hazard potential are maintained. The dam's primary purpose is flood risk reduction, serving as a critical infrastructure in safeguarding the community against potential water-related disasters. With a surface area of 0.3 acres and a normal storage capacity of 0.6 acre-feet, the dam's strategic location and design contribute significantly to the overall safety and resilience of the area.
As a key component of the flood management system in Lancaster County, Nebraska, Ash Hollow Dry Dam plays a crucial role in protecting the city of Waverly and its residents from the devastating effects of flooding. With its impressive structural height of 39 feet and a length of 2384 feet, the dam stands as a testament to effective water resource management and climate resilience efforts in the region. Through ongoing inspections, maintenance, and regulatory oversight, the dam continues to uphold its vital function in safeguarding the local community and mitigating the risks associated with potential flooding events.
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 Ash Hollow Dry Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Stevens Creek Nr. Lincoln | 29 cfs | → |
| Salt Creek At 70th St. At Lincoln | 988 cfs | → |
| Salt Creek At Greenwood | 809 cfs | → |
| Little Salt Creek Near Lincoln | 29 cfs | → |
| Rock Creek Near Ceresco | 103 cfs | → |
| Salt Creek At Lincoln | 578 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Ash Hollow Dry Dam.
Track Ash Hollow Dry 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 Ash Hollow Dry Dam
Where does the data for Ash Hollow Dry 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 High 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 Ash Hollow Dry Dam.