Where is McCullom Lake?

McCullom Lake is a lake in McHenry County, Illinois. Its water-quality measurements are published by Illinois EPA and shown on this page as reported.

How deep is McCullom Lake?

McCullom Lake has a maximum depth of 9.5 feet and an average depth of 4.4 feet. The lake covers 242 acres.

Are there boat ramps on McCullom Lake?

McCullom Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include McCullom Lake. Public access is listed as yes.

Can I fish at McCullom Lake?

McCullom Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Illinois's fish and wildlife agency, so check its current regulations before you go.

McCullom Lake

McHenry County, Illinois242 acresView map Directions

No nutrient or algae sampling on record from Illinois EPA for this lake.

Max depth

9.5 ft

Bathymetric survey

Area

242 acres

Surface area

Shoreline

2.5 mi

Measured length

Impaired · Nutrients (phosphorus, nitrogen)
10 ft max depth
Public access

See the measurements Directions Where to stay

McCullom Lake in McHenry County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 9.5 ft. Surface area: 242 acres.

Loading map…

McCullom Lake is a 242-acre lake in McHenry County, Illinois with a maximum depth of 10 feet (4-foot average). Limited fish-species data available. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, Illinois EPA. Methodology: how these readings are compared.

What McCullom Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. McCullom Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.

Whether McCullom Lake is safe to swim in today is a call for the Illinois Environmental Protection Agency and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Compare swimming lakes near Rockford →

Get alerts for McCullom Lake →

Water quality measurements for McCullom Lake

These are the measurements Illinois EPA publishes for McCullom Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data. TSI undefined.

Ask about McCullom Lake

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

9.5 ft

Average depth

4.4 ft

Surface area

242 acres

Shoreline

2.5 mi

Public access

Yes

Listed by Illinois EPA

Recreation & Access

Boat Landings

Yes

Public Access

McCullom LakePublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

Stays via Stay22

Stays near McCullom Lake

Compare lakeside cabins, hotels, and vacation rentals near McCullom Lake in McHenry County, Illinois — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near McCullom Lake

Prices for Oct 16–18, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Planning a whole trip? See where to stay at Illinois’s top lakes →

Follow McCullom Lake’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing McCullom Lake

→ McCullom Lake fishing regulations (limits, seasons, special rules)

EPA Impairment Status

McCullom Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Nutrients (phosphorus, nitrogen)

Designated uses not supporting: Other.

Source: EPA ATTAINS assessment unit IL_RTZD · Official waterbody report

Nearby Lakes in McHenry County

Wonder Lake3.8 miView →Defiance Lake4.4 miView →Pistakee Lake2.7 ft clear · Hypereutrophic4.4 miView →Wold Lake4.5 miView →Lily Lake3.3 ft clear · Eutrophic4.9 miView →Pistakee Lake4.8 miView →

Frequently asked questions about McCullom Lake

Where is McCullom Lake?: McCullom Lake is a lake in McHenry County, Illinois. Its water-quality measurements are published by Illinois EPA and shown on this page as reported.
What is the water quality of McCullom Lake?: McCullom Lake in McHenry County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 9.5 ft. Surface area: 242 acres.
Is McCullom Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. McCullom Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is McCullom Lake?: McCullom Lake has a maximum depth of 9.5 feet and an average depth of 4.4 feet. The lake covers 242 acres.
Are there boat ramps on McCullom Lake?: McCullom Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include McCullom Lake. Public access is listed as yes.
Can I fish at McCullom Lake?: McCullom Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Illinois's fish and wildlife agency, so check its current regulations before you go.