Beach · Lake Michigan · Illinois
Marion Mahoney Griffin Beach
A public beach on Lake Michigan in Cook County, Illinois, 0.14 miles of shore. The state samples the water for bacteria daily through a 101-day swim season.
The beach
On the record
- Water
- Lake Michigan
- Location
- Cook County, Illinois
- Length
- 0.14 miles
- Owner
- Public
- Access
- Public Access
- Water sampling
- Yes — daily in the swim season
- Swim season
- 101 days, as reported
- Monitoring tier
- Tier 1 — the state’s highest monitoring priority
- Water quality standard
- E. coli, geometric mean: 300 CFU per 100 mL
- EPA beach ID
- IL603994
- Coordinates
- 42.0170° N, 87.6630° W to 42.0160° N, 87.6620° 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 Michigan beaches
- Howard Street Park Beach0.1 mi · IL
- Leone Beach0.3 mi · sampled · IL
- Juneway Terrace Park Beach0.4 mi · IL
- Pratt Blvd And Park Beach0.8 mi · sampled · IL
- Evanston South Beach0.9 mi · sampled · IL
- North Shore Avenue Beach0.9 mi · sampled · IL
Straight-line distance.
On the horizon
Lighthouses nearby
- Grosse Point Light3.3 mi · deactivated
- Wilson Avenue Crib Light5.1 mi
- William E. Dever Crib Light6.9 mi
On shore nearby
Worth the stop
- Chicago Lakefront Trail9.1 mi · drive
Off the beach
What to fish on Lake Michigan
Source
Facts on this page are from the EPA BEACON profile for beach IL603994, the record Illinois 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.