Lake Plymouth dam
Lake Plymouth
Lake Plymouth, located in Plymouth, Connecticut, is a picturesque water resource with a primary purpose of recreation. The dam at Lake Plymouth, built in 1900, stands at 7 feet tall and spans 280 feet in length, creating a storage capacity of 128 acre-feet. The lake covers a surface area of 32.1 acres and has a drainage area of 0.35 square miles, with a maximum discharge rate of 133 cubic feet per second.
Managed by a private owner, Lake Plymouth is regulated by the Connecticut Department of Energy and Environmental Protection (DEEP) for permitting, inspection, and enforcement. The dam is classified as having a significant hazard potential and is currently assessed to be in fair condition as of the last inspection in April 2019. While there are no associated structures or locks, the spillway at Lake Plymouth has a width of 11 feet. Enthusiasts of water resources and climate will appreciate the recreational opportunities and scenic beauty offered by Lake Plymouth, making it a notable destination for outdoor activities in Litchfield County, Connecticut.
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 Lake Plymouth -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Naugatuck River At Thomaston | 222 cfs | → |
| Nonewaug River At Minortown | 19 cfs | → |
| Quinnipiac River At Southington | 33 cfs | → |
| Burlington Brook Near Burlington | 21 cfs | → |
| Farmington River At Unionville | 576 cfs | → |
| Weekeepeemee River At Hotchkissville | 33 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lake Plymouth.
Boat launches
- Lake Plymouth Boulevard 191, Plymouth
- Farmington River Trail Collinsville
- Batterson Park Pond
- Silver Lake
- Burr Pond
- West Hill Pond Boat Launch
Campgrounds
- Black Rock State Park
- Point Folly - White Memorial
- Windmill Hill - White Memorial
- Cozy Hill Campground
- Deep Campsite
- Sr1
Fishing spots
- Great Brook Reservoir
- Lower Fulton Park Pond
- Lake Quassapaug
- Seymour Reservoir Number 4
- Reservoir Number 2
- Papermill Pond
Paddle runs
- Begins Downstream Of The Borough Of Bantam, At Stoddard Road Bridge To The Confluence With The Shepaug River
- Begins Below The Tailrace Of The Lower Collinsville Dam To The Route 187 Bridge
- The Confluence With The Nepaug River To A Point 0.2 Miles Below The Lower Collinsville Dam Tailrace
- Pond Downstream Of Shepaug Reservoir Dam, Marked By Service Road Bridge To Ends In Backwaters Of Lake Lillinonah, Near Roxbury Falls
- New Hartford/Canton Town Line To The Confluence With The Nepaug River
- Kent Bridge To Boardman Bridge
Track Lake Plymouth 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 Lake Plymouth
Where does the data for Lake Plymouth 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 Lake Plymouth.