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Loch Lomond Lake

Lake County, WisconsinLimited DataOligotrophic

Loch Lomond Lake is a 72-acre cold, clear oligotrophic lake in Lake County, IL. Water quality is graded A based on 1 sampling years through 2020. Compared to the 15 other monitored lakes in Lake County, Loch Lomond Lake ranks #1 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2020-09-19. Grade methodology: LakeGrade methodology.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 16.5 ft down. Trophic State Index: 37.

MetricValueGrade
Water Clarity (Secchi Depth)16.5 ftA
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)37Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Surface Area72 acres

Location

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County Ranking

Ranked #1 of 16 lakes in Lake County

Nearby Lakes in Lake County

A
Csmi 2015 Station Eg Lake
Lake County
B
Timber Lake
Lake County
B
Round Lake
Lake County
B
Grays Lake
Lake County
B
Catherine Lake
Lake County
C
Channel Lake
Lake County

More Wisconsin Lake Rankings

Cleanest lakes in Wisconsin

Top 25 by overall water quality score

Best swimming lakes in Wisconsin

Grade A/B + low algae filter

Family fishing lakes in Wisconsin

Panfish-rich, public access

All Wisconsin lakes

Full state directory

Other Grade A Lakes in Wisconsin

Diversey Harbor Lake

Cook County · Clarity: 25.6 ft

Axehead Lake

Cook County · Clarity: 11.9 ft

Powderhorn Lake

Cook County · Clarity: 10.1 ft

Baumann Park Lake

Winnebago County · Clarity: 10.2 ft

Csmi 2015 Station S Lake

Cook County · Excellent

Oligotrophic Lakes in Wisconsin

Diversey Harbor LakeAxehead LakeCsmi 2015 Station S Lake

Reservoir Info (USACE NID)

Loch Lomond Lake is a man-made reservoir impounded by the Loch Lomond Dam (completed 1958), built primarily for recreation on the BULL CREEK; earth-type dam, 14 ft tall and 550 ft long.

Surface area
72 ac
Normal storage
140 ac-ft
Max storage
821 ac-ft
Drainage area
1.8 sq mi
Hazard class
Significant
Owner
LOCH LOMOND PROPERTY OWNERS ASSOCIATION

Source: USACE National Inventory of Dams, NID ID IL00652 · Operator website

EPA Impairment Status

Loch Lomond 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)Pathogens (E. coli, fecal)Turbidity

Source: EPA ATTAINS assessment unit IL_RGU · Official waterbody report

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Most recent sample: 2020-09-19

Monitoring stations: 1