Danielson Mill Dam dam
Danielson Mill Dam
Located in Medfield, Massachusetts, the Danielson Mill Dam is a significant earth dam on the West Branch of the Nantasket River, primarily serving recreational purposes. Managed by the local government, the dam is regulated by the Department of Conservation and Recreation, with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations. With a height of 7 feet and a hydraulic height of 6 feet, the dam boasts a storage capacity of 32.6 acre-feet and a surface area of 6.4 acres.
Despite its importance for recreation, the Danielson Mill Dam is classified as having a significant hazard potential and a poor condition assessment, last assessed in October 2017. The dam lacks an emergency action plan and has not been updated in recent years, raising concerns about its ability to respond effectively in case of emergencies. However, with a moderate risk assessment rating of 3, there is room for improvement through the implementation of risk management measures and regular monitoring of its condition.
Water resource and climate enthusiasts interested in the Danielson Mill Dam will find a unique opportunity to study the intersection of recreational infrastructure and environmental conservation. The dam's location in Norfolk County, Massachusetts, offers a valuable case study for understanding the challenges and opportunities associated with managing dams in urban areas, emphasizing the importance of proactive maintenance and risk mitigation strategies to ensure the safety and sustainability of water resources 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 Danielson Mill Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Neponset River At Norwood | 18 cfs | → |
| Charles River At Medway | 66 cfs | → |
| Charles River At Dover | 172 cfs | → |
| East Branch Neponset River At Canton | 19 cfs | → |
| Neponset River At Greenlodge St Near Canton | 72 cfs | → |
| Mother Brook At Dedham | 42 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Danielson Mill Dam.
Boat launches
- Blue Trail Sherborn
- Bridge Street 1, Dover
- Lake Street Sherborn
- Beach Street Sharon
- Rose Donahue Boat Launch
- Ames Street Dedham
Track Danielson Mill 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 Danielson Mill Dam
Where does the data for Danielson Mill 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 Danielson Mill Dam.