Canaan Sewage Lagoon Dam dam
Canaan Sewage Lagoon Dam
Located in Canaan, New Hampshire, the Canaan Sewage Lagoon Dam is a significant earth dam completed in 1991 with a height of 13 feet and a length of 1240 feet. Owned by the local government, this dam serves a primary purpose of "Other" and is regulated by the NHDES Dam Bureau. With a normal storage capacity of 5.4 million gallons and a hazard potential rated as "Significant," this dam plays a crucial role in managing water resources in the area.
The dam, designed as an earth structure with a buttress core type, is inspected regularly by the state regulatory agency, with the last assessment conducted in June 2015, showing a satisfactory condition. Despite its high risk assessment level of 2, the Canaan Sewage Lagoon Dam has not experienced any major modifications or incidents. With no spillway and a surface area of 0.77 acres, this dam is an essential component of the local water infrastructure, ensuring the safe containment and management of wastewater.
In the event of an emergency, the dam does not have an Emergency Action Plan (EAP) prepared, raising concerns about the readiness for potential risks. However, with state jurisdiction, permitting, and enforcement in place, the Canaan Sewage Lagoon Dam remains a crucial structure for water management in Grafton County, New Hampshire. For water resource and climate enthusiasts, understanding the role and maintenance of dams like this is essential for sustainable water management 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 Canaan Sewage Lagoon Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Baker River Near Rumney | 367 cfs | → |
| Smith River Near Bristol | 180 cfs | → |
| Connecticut River At West Lebanon | 6,790 cfs | → |
| Ompompanoosuc River At Union Village | 16 cfs | → |
| Pemigewasset River At Plymouth | 1,900 cfs | → |
| Ottauquechee River At North Hartland | 394 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Canaan Sewage Lagoon Dam.
Boat launches
- Tewksbury Pond Boat Launch
- Grafton Pond Boat Launch
- Crystal Lake Boat Launch
- George Pond Boat Launch
- Mascoma Lake Boat Launch
- Spectacle Pond Boat Launch
Campgrounds
- Cardigan Campsites
- Clark Brook Campsite
- Moose Mountain Shelter
- Trapper John Shelter
- Camp Wilmot
- Smarts Mountain Campsite
Paddle runs
- Thornton Railroad Bridge To Bridgewater/Bristol Town Line
- Begins In Franklin To Sewall's Island
- Woodstock/Thornton Town Line To Thornton Railroad Bridge
- Sewall's Island To Manchester Street Bridge
- Headwaters At Profile Lake To Southern Boundary Of Franconia Notch State Park
- Source Above Fr 55 To Proclamation Boundary (Stony Brook)
Track Canaan 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 Canaan Sewage Lagoon Dam
Where does the data for Canaan 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 Canaan Sewage Lagoon Dam.