Exeter Sewage Lagoon Dam dam
Exeter Sewage Lagoon Dam
The Exeter Sewage Lagoon Dam in New Hampshire is a significant structure owned by the local government and regulated by the NHDES Dam Bureau. Completed in 1989, this Earth-type dam stands at a height of 12 feet and has a length of 1270 feet, with a storage capacity of 55 acre-feet. It serves a primary purpose that is classified as 'Other', and its hazard potential is deemed 'Significant' with a satisfactory condition assessment as of December 2016.
Located in Rockingham County, the Exeter Sewage Lagoon Dam plays a crucial role in managing water resources and protecting the surrounding area from potential flooding. Despite being a buttress-type dam with no spillway, it has a maximum discharge capacity of 30 cubic feet per second. The dam's risk assessment is categorized as 'High (2)', highlighting the importance of implementing effective risk management measures to ensure the safety of the structure and the community.
With its last inspection conducted in September 2020 and an inspection frequency of 4 times a year, the Exeter Sewage Lagoon Dam remains an essential infrastructure that requires careful monitoring and maintenance to mitigate any potential risks associated with its operation. Climate and water resource enthusiasts will find this dam a fascinating case study in infrastructure management and the intersection of environmental conservation with public health and 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 Exeter Sewage Lagoon Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Exeter River At Haigh Road | 52 cfs | → |
| Winnicut River At Greenland | 17 cfs | → |
| Lamprey River Near Newmarket | 119 cfs | → |
| Oyster River Near Durham | 11 cfs | → |
| Isinglass R At Rochester Neck Rd | 53 cfs | → |
| Parker River At Byfield | 9 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Exeter Sewage Lagoon Dam.
Boat launches
- Squamscott River Boat Launch
- Lamprey River Boat Launch
- Piscassic River Boat Launch
- Greenwood Pond Boat Launch
Campgrounds
- Tidewater Campground
- Remote Campsite
- Old Stage Campground
- Salisbury State Park Reservation
- Saddleback Campground
- Windham Town Forest Tent Platforms
Paddle runs
Track Exeter Sewage Lagoon 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 Exeter Sewage Lagoon Dam
Where does the data for Exeter Sewage Lagoon 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 Significant 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 Exeter Sewage Lagoon Dam.