Norumbega Reservoir Dam No. 1 dam
Norumbega Reservoir Dam No. 1
Norumbega Reservoir Dam No. 1, located in Weston, Massachusetts, is a state-regulated earth dam with a primary purpose of water supply. Completed in 1940, this dam stands at a height of 42 feet and has a hydraulic height of 34 feet, providing a storage capacity of 500 acre-feet. The dam, situated on Seaverns Brook, covers a surface area of 0.06 square miles and has a drainage area of 0.13 square miles.
Despite being classified as having a high hazard potential, Norumbega Reservoir Dam No. 1 is in fair condition, as per the last inspection conducted in September 2016. The dam is equipped with an uncontrolled spillway and has an inspection frequency of every two years. The risk assessment for this dam is rated as moderate, with no specific risk management measures listed. Overall, this dam serves as a critical water resource infrastructure in Middlesex County, Massachusetts, under the oversight of the Department of Conservation and Recreation.
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 Norumbega Reservoir Dam No. 1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Stony Brook Reservoir At Dam Near Waltham | 0 cfs | → |
| Stony Brook At Rt 20 At Waltham | 27 cfs | → |
| Charles River At Wellesley | 87 cfs | → |
| Charles River At Waltham | 127 cfs | → |
| Hobbs Bk Below Cambridge Res Nr Kendall Green | 7 cfs | → |
| Lake Cochituate Outlet At Framingham | 25 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Norumbega Reservoir Dam No. 1.
Boat launches
- College Road Wellesley
- Woerd Avenue 29-49, Waltham
- Dudley Road 43, Wayland
- Green Way Wayland
- Charles River Greenway Waltham
- Commonwealth Road 39, Natick
Track Norumbega Reservoir Dam No. 1 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 Norumbega Reservoir Dam No. 1
Where does the data for Norumbega Reservoir Dam No. 1 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 High 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 Norumbega Reservoir Dam No. 1.