Monroe Reservoir Dam dam
Monroe Reservoir Dam
Monroe Reservoir Dam, also known as Mombasha Lake, is a critical water resource located in Orange County, New York. Managed by the Village of Monroe, this earth dam serves multiple purposes, including recreation and water supply. With a dam height of 8 feet and a length of 234 feet, it has a storage capacity of 3250 acre-feet and covers a surface area of 325 acres.
Situated on the TR-Ramapo River, Monroe Reservoir Dam is regulated by the New York State Department of Environmental Conservation (NYS DEC) and has a low hazard potential. Despite being rated as "Not Rated" in terms of condition assessment, the dam has a moderate risk level. With a maximum discharge capacity of 280 cfs and an uncontrolled spillway width of 64 feet, the dam plays a crucial role in managing water flow in the region.
Although the dam was last inspected in August 2013, its emergency action plan (EAP) was last revised in February 2012. While the dam meets state permitting and inspection requirements, it is essential for stakeholders to ensure continued monitoring and maintenance to mitigate potential risks and ensure the safety and sustainability of Monroe Reservoir Dam for the 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 Monroe Reservoir Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Ramapo River At Ramapo Ny | 55 cfs | → |
| Mahwah River Near Suffern Ny | 7 cfs | → |
| Wanaque River At Awosting Nj | 12 cfs | → |
| Ringwood Creek Near Wanaque Nj | 8 cfs | → |
| Ramapo River At Suffern Ny | 35 cfs | → |
| Ramapo River Near Mahwah Nj | 73 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Monroe Reservoir Dam.
Boat launches
- Laurel Meadow Drive Town Of Warwick
- Blue Lake Road Town Of Warwick
- Ringwood-Ramapo Trail Ringwood
- Battlefield Road Town Of Stony Point
- Greenwood Lake Turnpike Ringwood
- Broadway Buchanan
Campgrounds
- Beaver Pond - Harriman State Park
- Beaver Pond Campsite
- Round Pond Military
- Blue Mountain Reservation
- Camping For Hikers On Ballfield Graymoor Center
- Croton Point Park
Fishing spots
Track Monroe Reservoir 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 Monroe Reservoir Dam
Where does the data for Monroe Reservoir 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 Low 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 Monroe Reservoir Dam.