Hillsborough Sewage Lagoon Dam dam
Hillsborough Sewage Lagoon Dam
The Hillsborough Sewage Lagoon Dam in Hillsborough, New Hampshire, is a local government-owned structure that serves a critical purpose in managing wastewater in the area. Completed in 1984, this earth dam stands at a height of 12 feet and stretches for 2000 feet, providing storage for up to 11 acre-feet of water. Despite not having a spillway, the dam is regulated by the NHDES Dam Bureau and undergoes regular inspections to ensure its safety.
With a significant hazard potential and a high risk assessment rating, the Hillsborough Sewage Lagoon Dam is a key infrastructure piece in the region's water resource management. While the condition assessment is currently listed as "Not Rated," the dam is subject to frequent inspections and emergency action plans are likely in place to address any potential issues. Its location in a densely populated area underscores the importance of maintaining its structural integrity to prevent any environmental or public safety risks.
As climate change continues to impact water resources and infrastructure, the Hillsborough Sewage Lagoon Dam stands as a crucial component in the local ecosystem. With the potential for increased extreme weather events, ensuring the resilience and safety of this dam is essential for protecting the surrounding community and maintaining the integrity of the water resource infrastructure.
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 Hillsborough Sewage Lagoon Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Contoocook River Near Henniker | 782 cfs | → |
| North Branch River Near Antrim | 61 cfs | → |
| Contoocook R Bl Hopkinton Dam At W Hopkinton | 1,080 cfs | → |
| Piscataquog River Bl Everett Dam | 8 cfs | → |
| Warner River At Davisville | 405 cfs | → |
| South Branch Piscataquog River Near Goffstown | 143 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hillsborough Sewage Lagoon Dam.
Boat launches
- Pleasant Pond Boat Launch
- Franklin Pierce Lake Boat Launch
- Hopkinton
- Upper Pond Boat Launch
- Gregg Lake Boat Launch
- French Pond Boat Launch
Campgrounds
- Mile-Away Campground
- Fox Brook Tent Site
- Camp Spaulding
- Camp Wanocksett
- Northstar Campground
- Mt Monadnock State Park Campground
Paddle runs
- Sewall's Island To Manchester Street Bridge
- Begins In Franklin To Sewall's Island
- First Bridge Upstream On Route 100 To Confluence With West River
- Headwaters To First Bridge Upstream On Route 100
- Headwaters To Crossing Of Route 100 Near Route 155
- Headwaters To Confluence With West River (End Of Sherman Road)
Track Hillsborough 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 Hillsborough Sewage Lagoon Dam
Where does the data for Hillsborough 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 Hillsborough Sewage Lagoon Dam.