Crystal Lake Dam dam
Crystal Lake Dam
Crystal Lake Dam, located in Tolland, Connecticut, is a private earth dam completed in 1900 primarily for recreational purposes. Spanning 250 feet in length with a height of 11 feet, the dam holds a maximum storage capacity of 1450 acre-feet and covers a surface area of 178 acres. With a significant hazard potential and a moderate risk assessment rating, the dam's spillway type is uncontrolled with a width of 19 feet, allowing for a maximum discharge of 350 cubic feet per second.
Managed by the Connecticut Department of Energy and Environmental Protection (DEEP), the dam is inspected regularly every 7 years for structural integrity and safety. Despite its age, the condition assessment of Crystal Lake Dam has not been rated, and emergency action plans have not been prepared or revised. The dam poses a potential risk to downstream areas in the event of a failure, highlighting the importance of ongoing monitoring and maintenance to ensure the safety of the surrounding community and environment.
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 Crystal Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Broad Brook At Broad Brook | 22 cfs | → |
| Connecticut River At Thompsonville | 18,900 cfs | → |
| Mount Hope River Near Warrenville | 40 cfs | → |
| Willimantic River Near Coventry | 160 cfs | → |
| Hockanum River Near East Hartford | 83 cfs | → |
| Chicopee River At Indian Orchard | 1,210 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Crystal Lake Dam.
Boat launches
- Wilbur Cross Highway Union
- Bolton Lake (Lower)
- Kings Island (Connecticut River)
- Coventry Lake
- Bigelow Pond
- South End Bridge Agawam
Campgrounds
- Wilderness Lake Campground
- Brialee
- Beech Grove 5
- Primitve Camping Area
- Westover Arb Military
- Highland Campground
Fishing spots
- Trout Hatchery
- Lake Washington Fishing Area
- Great Brook Reservoir
- Lower Fulton Park Pond
- Baker Cove
- Twotree Island Channel
Paddle runs
- Begins Below The Tailrace Of The Rainbow Dam To The Confluence With The Connecticut River
- 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
- The Confluence With The Nepaug River To A Point 0.2 Miles Below The Lower Collinsville Dam Tailrace
- New Hartford/Canton Town Line To The Confluence With The Nepaug River
Track Crystal 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 Crystal Lake Dam
Where does the data for Crystal 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 Crystal Lake Dam.