Alder Marsh dam
Alder Marsh
Alder Marsh, located in Lebanon Township, Pennsylvania, is a state-regulated Earth dam completed in 1948 with a primary purpose of recreation. This dam, standing at a height of 10 feet and a length of 175 feet, has a storage capacity of 266 acre-feet and a normal storage of 78 acre-feet. The dam is situated on Alder Marsh Brook and is under the jurisdiction of the Pennsylvania Department of Environmental Protection.
Despite its fair condition assessment, Alder Marsh poses a high hazard potential due to its location and design. With a drainage area of 0.91 square miles, this dam plays a crucial role in managing water resources in the area and providing recreational opportunities for the community. The dam's maintenance and inspection are regularly carried out by the state, ensuring its structural integrity and safety for the surrounding environment.
Alder Marsh serves as a vital infrastructure for water resource management and recreation in Wayne County, Pennsylvania. As a regulated state dam, it underscores the importance of sustainable water practices and ecosystem preservation in the face of climate change challenges. With its historical significance and ongoing maintenance efforts, Alder Marsh stands as a testament to the intersection of water resource management and environmental stewardship in the region.
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 Alder Marsh -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Equinunk Creek Near Dillontown | 41 cfs | → |
| West Branch Lackawaxen River Near Aldenville | 35 cfs | → |
| Delaware River At Lordville Ny | 1,980 cfs | → |
| Dyberry Creek Near Honesdale | 76 cfs | → |
| Delaware River At Callicoon Ny | 2,410 cfs | → |
| West Branch Lackawaxen River At Prompton | 62 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Alder Marsh.
Boat launches
Campgrounds
- Soaring Eagle Campground
- Lander's Skinners Falls Campground
- Keen Lake Camping And Cottage Resort
- French Woods Performing Arts Camp
- Lander's Narrowsburg Campground
- Sylvania Tree Farm Camp Sites
More reservoirs
Track Alder Marsh 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 Alder Marsh
Where does the data for Alder Marsh 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 Alder Marsh.