Beach · Lake Ontario · New York
Chedmardo
A public beach on Lake Ontario in Oswego County, New York, 0.84 miles of shore. The state samples the water for bacteria twice a month through a 104-day swim season.
The beach
On the record
- Water
- Lake Ontario
- Location
- Oswego County, New York
- Length
- 0.84 miles
- Owner
- Public
- Access
- Private Access
- Water sampling
- Yes — twice a month in the swim season
- Swim season
- 104 days, as reported
- Monitoring tier
- Tier 2 (Tier 1 is highest)
- Water quality standard
- E. coli, single sample: 235 per 100 mL
- EPA beach ID
- NY280017
- Coordinates
- 43.5410° N, 76.2211° W to 43.5518° N, 76.2140° W
As the state reported it to EPA for the 2025 season. Sampling schedules change year to year. How beach monitoring works →
Down the shore
Nearest Ontario beaches
- Selkirk Shores State Park Beach - South0.9 mi · sampled · NY
- Selkirk Shores State Park Beach0.9 mi · sampled · NY
- Mexico Point State Park (Town)2.3 mi · sampled · NY
- Dowie Dale3.0 mi · sampled · NY
- Brennan'S Beach3.3 mi · sampled · NY
- ONTARIO SHORES (Rainbow Shores)5.4 mi · sampled · NY
Straight-line distance.
By boat
Launches nearby
- Selkirk Shores State Park2.0 mi · unimproved trailer launch
- Mexico Point2.1 mi · trailer ramp
- Sandy Creek DEC launch8.6 mi · trailer ramp
On the horizon
Lighthouses nearby
- Selkirk Light2.5 mi · deactivated
Ashore
State parks nearby
- Selkirk Shores State Park1.7 mi
- Mexico Point State Park2.0 mi
Off the beach
What to fish on Lake Ontario
Source
Facts on this page are from the EPA BEACON profile for beach NY280017, the record New York files under the federal BEACH Act, retrieved 2026-10-10. The county is placed from the beach’s own coordinates. A blank field means the record is silent. Parking, fees, lifeguards and dog rules are set by whoever runs the beach; check with them before you go.
Chart shoreline generalized from Natural Earth (public domain). Not for navigation. Something wrong or missing? Write to contact@greatamericanlakes.com.