Manitook Lake Dam dam
Manitook Lake Dam
Manitook Lake Dam, also known as Radwillowicz Pond, is a private dam located in Granby, Connecticut. With a primary purpose of recreation, this masonry dam stands at a height of 12 feet and spans 30 feet in length. Situated on Salmon Brook, it serves as a picturesque spot for outdoor enthusiasts to enjoy water-based activities in the surrounding area.
Despite its recreational appeal, the dam's significant hazard potential necessitates regular inspections to ensure its structural integrity. The most recent inspection in July 2020 deemed its condition satisfactory, with a moderate risk assessment rating. While the dam is uncontrolled by a spillway, its 0.3-acre surface area and 1.59 square mile drainage area contribute to its importance in managing water resources in the region.
With the dam being state-regulated and permitted, and the Connecticut Department of Energy and Environmental Protection (DEEP) overseeing its enforcement and inspection, Manitook Lake Dam remains a vital component in water resource management and climate resilience efforts in the Hartford County area. Enthusiasts of water resources and climate sustainability can appreciate the careful balance between recreational use and environmental safety that this dam represents.
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 Manitook Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Stony Brook Near West Suffield | 4 cfs | → |
| Farmington River At Tariffville | 446 cfs | → |
| Hubbard River Nr. West Hartland | 8 cfs | → |
| Connecticut River At Thompsonville | 18,900 cfs | → |
| Westfield River Near Westfield | 371 cfs | → |
| West Branch Farmington River At Riverton | 134 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Manitook Lake Dam.
Boat launches
- Rainbow Reservoir
- Riverside Road Simsbury
- Kings Island (Connecticut River)
- Howells Pond
- Farmington River Trail Collinsville
- Bissell Bridge (Connecticut River)
Campgrounds
- Primitve Camping Area
- Roaring Brook Camp Area
- James Stocking Youth Group Camping Area
- Granville State Forest
- Haws Memorial - American Legion State Forest
- Deep Campsite
Fishing spots
- Great Brook Reservoir
- Lower Fulton Park Pond
- Lake Quassapaug
- Seymour Reservoir Number 4
- Reservoir Number 2
- Seymour Reservoir Number 2
Paddle runs
- The Confluence Of The East And West Branches To The Confluence With The Farmington River In East Granby
- The Massachusetts-Connecticut State Line In Hartland To The Confluence With The Salmon Brook Main Stem
- The Hartland Headwaters To The Confluence With The Salmon Brook Main Stem
- Begins Below The Tailrace Of The Rainbow Dam To The Confluence With The Connecticut River
- New Hartford/Canton Town Line To The Confluence With The Nepaug River
- The Confluence With The Nepaug River To A Point 0.2 Miles Below The Lower Collinsville Dam Tailrace
Track Manitook Lake 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 Manitook Lake Dam
Where does the data for Manitook Lake 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 Manitook Lake Dam.