The lake the hamlet is built around
Lake Mahopac covers about 587 acres, and the Mahopac hamlet wraps around it. The lake has three privately owned islands, Fairy, Petre and Canopus, and it allows motorboats. Homes along and near the shoreline range from long-standing lake cottages to year-round houses, and they share the same Town of Carmel building department and flood law as the rest of Mahopac.
We do not claim a boundary for a Lake Mahopac neighborhood, because the lake is ringed by streets rather than a single area. If you can see the water from your property or you live a few streets back, call and give us the address.
The dam, the spillway and Lake Shore Drive in the county plan
The Town of Carmel section of the Putnam County hazard mitigation plan lists the Lake Mahopac dam among the critical facilities in the mapped 1 percent and 0.2 percent annual-chance floodplain. It also says the spillway overflows when debris has built up and the gates have not been opened, and the town reports localized flooding when that happens.
The plan includes a project, tied to a New York State DEC Order on Consent, for an engineering assessment to address dam deficiencies, with an estimate of $100,000.
The plan also lists Lake Shore Drive among the areas where flooding stays problematic because of drainage issues, and it names Lakeshore Drive in Mahopac for outreach to owners of repetitive-loss properties. We are not engineers and we do not assess dams. This is public planning information. The practical point is that water near the lake can come from more than one direction.
Neighborhood-specific FEMA flood-zone status not verified. The FEMA Flood Map Service Center will show the mapped zone for a specific address.
What the county plan says and what it does not
| Topic | Stated in the plan | Not stated |
|---|---|---|
| Lake Mahopac dam | Listed as a critical facility in the 1 percent and 0.2 percent floodplain | Which homes are affected by it |
| Spillway | Overflows when debris builds up and gates stay shut, with localized flooding | How often it happens |
| Lake Shore Drive | Flooding remains problematic because of drainage | Which properties flood |
| Flood insurance | Town-wide figures only | Figures for streets around the lake |
Figures and findings are from the Town of Carmel section of the Putnam County hazard mitigation plan.
What water damage looks like in a lakeside home
Water from outside
Runoff and high water can enter lower levels. See flood damage cleanup.
Supply and drain leaks
Seasonal houses can sit empty, and a split line may run unnoticed. See frozen pipe water damage.
Wet floors and walls
Wood floors and drywall need readings before repairs. See hardwood floor water damage.
Ceilings and roofs
Storm rain finds its way through roofs and windows. See ceiling water damage repair.
Safe first steps at a lakeside house
Work through these only as far as it is safe.
Check for danger
If water is rising or reaches electrical equipment, leave and call emergency services.
Shut off the supply
Close the main water valve only if you can reach it without standing in water.
Avoid dirty water
Lake and drain water can be contaminated, so keep people and pets out of it.
Do not use household vacuums or fans on it
Ordinary equipment is not suitable for standing or contaminated water.
Document
Photograph the source, the water line and damaged items when it is safe to do so.
Insurance records for lakeside losses
Coverage depends on the cause of the loss and the terms of your policy. A homeowners policy and a flood policy cover different events, so ask your agent about both before a storm season, and again when you file.
We can supply photos, moisture readings and a written scope. Those records describe the work. They do not guarantee that an insurer will pay.
Water in your Lake Mahopac home
Call the emergency line and tell us the street and the source.
Lake Mahopac on the map
The map is centered on Lake Mahopac so you can see how close we are. Our base is on Route 6 in Mahopac.
Lake Mahopac water damage questions
Yes. Lake Mahopac is in the hamlet where our base is, on Route 6. Call and give us the address.
Zones apply to specific properties. We have not verified a status for the neighborhood. Use the FEMA Flood Map Service Center and the Town of Carmel building department for your address.
We cannot say. The county plan lists the dam in the mapped floodplain and describes spillway overflow with localized flooding, but it does not name affected homes. Ask the town.
We handle water in the house and attached structures. Docks and boat lifts belong to marine contractors.
The Town of Carmel building department, because Mahopac is a hamlet in that town.