Loch Lomond Lake
Lake County, Illinois72 acresView mapDirections
Illinois EPA publishes the water-quality measurements for Loch Lomond Lake. Here is what has been measured.
- Impaired · Nutrients (phosphorus, nitrogen)
- 38 ft max depth
- Public access
- Limited data
Loch Lomond Lake in Lake County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Water clarity: 16.5 ft visibility. Surface area: 72 acres.
Loch Lomond Lake is a 72-acre lake in Lake County, Illinois with an estimated average depth of about 38 feet. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled 2020-09-19. Methodology: how these readings are compared.
What Loch Lomond Lake is good for
From access and monitoring records, not editorial picks.
- Clear water16.5 ft of visibility
Swimming conditions
No readingBacteria advisory
Nutrient and algae readings are not a swimming clearance. Loch Lomond Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), pathogens (E. coli, fecal), turbidity. Check local advisories before you swim.
Whether Loch Lomond 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.
Water quality measurements for Loch Lomond Lake
These are the measurements Illinois EPA publishes for Loch Lomond Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 16.5 ft down. TSI 37.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 16.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 37 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Loch Lomond Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~38 ft est.
Surface area
72 acres
Public access
Yes
Listed by Illinois EPA
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Illinois has not published bathymetry for Loch Lomond Lake.
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.7 mi
HydroLAKES / HydroSHEDS
Elevation
741 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
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Fishing Loch Lomond 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
Designated uses not supporting: Recreation, Other.
Source: EPA ATTAINS assessment unit IL_RGU · Official waterbody report
Regulated Pollution Sources Nearby
10 EPA-permitted facilities operate within about 5 miles of Loch Lomond Lake under Clean Water Act (NPDES) discharge permits, including 3 classified by the EPA as major dischargers. 7 facilities have a reported Clean Water Act violation in the past three years.
- Libertyville Stp, Village OfLibertyville · 3.9 mi away · NPDES IL0029530MajorRecent violation
- Mundelein Stp, Village OfLibertyville · 4 mi away · NPDES IL0022501MajorRecent violation
- Lcpwd-New Century Town WrfVernon Hills · 4.9 mi away · NPDES IL0022071MajorRecent violation
- University Of St Mary Of The Lake / Mundelein Seminary StpMundelein · 1 mi away · NPDES IL0024350Recent violation
- Dayspring Bible College And Seminary StpMundelein · 1.2 mi away · NPDES IL0050661Recent violation
- Fremont School District 79 - StpMundelein · 2.8 mi away · NPDES IL0034746Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Nearby Lakes in Lake County
Frequently asked questions about Loch Lomond Lake
Where is Loch Lomond Lake?
- Loch Lomond Lake is a lake in Lake County, Illinois. Its water-quality measurements are published by Illinois EPA and shown on this page as reported.
What is the water quality of Loch Lomond Lake?
- Loch Lomond Lake in Lake County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Water clarity: 16.5 ft visibility. Surface area: 72 acres.
Is Loch Lomond Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Loch Lomond Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), pathogens (E. coli, fecal), turbidity. Check local advisories before you swim.
How deep is Loch Lomond Lake?
- No published bathymetric survey covers Loch Lomond Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 38 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 72 acres.
Can I fish at Loch Lomond Lake?
- Public access to Loch Lomond Lake is listed as yes on the lake record. 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.
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Where this data comes from
4 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS4 samples · 2020
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)