Grand Calumet Lagoon Lake is a mesotrophic lake in Lake County, Indiana. Water quality is graded B based on 2 sampling years through 2022. Phosphorus level is declining over recent sampling years. Compared to the 6 other monitored lakes in Lake County, Grand Calumet Lagoon Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Indiana DNR, last sampled 2022-10-12. Grade methodology: LakeGrade methodology.
Watch Grand Calumet Lagoon Lake water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
No clarity data. Phosphorus level: 39 µg/L. Chlorophyll-a: 3.1 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 39 µg/L | C |
| Chlorophyll-a (Algae) | 3.1 µg/L | A |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Grand Calumet Lagoon Lake
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Top-rated places to stay near Grand Calumet Lagoon Lake
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Fishing Grand Calumet Lagoon Lake
Water Quality Trend: → Stable
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +3.5 µg/L/yr | 3 |
| Chlorophyll-a | ↑ Improving | -1.1 µg/L/yr | 2 |
Water Temperature
Grand Calumet Lagoon Lake averages about 78°F at the surface in summer, usually warmest in Aug (about 80°F) and coldest in Sep (about 68°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 19 field readings (2013–2022) via the EPA Water Quality Portal. See the full Grand Calumet Lagoon Lake water temperature breakdown →
Location
County Ranking
Ranked #3 of 7 lakes in Lake County
Nearby Lakes in Lake County
Explore Grand Calumet Lagoon Lake across LakeGrade
More Indiana Lake Rankings
Other Grade B Lakes in Indiana
Mesotrophic Lakes in Indiana
More records, surveys & data sources
EPA Impairment Status
Grand Calumet Lagoon Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit INC01P1083_00 · Official waterbody report · Matched by proximity (0.49 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
49 EPA-permitted facilities operate within about 5 miles of Grand Calumet Lagoon Lake under Clean Water Act (NPDES) discharge permits, including 2 classified by the EPA as major dischargers. 3 facilities have a reported Clean Water Act violation in the past three years.
- Portage Utility Service Facility WwtpPortage · 3.3 mi away · NPDES IN0024368MajorRecent violation
- Us Steel Corp Midwest PlantPortage · 4.6 mi away · NPDES IN0000337MajorRecent violation
- Flying J Travel Plaza 650 Lake StationGary · 2.4 mi away · NPDES IN0062081Recent violation
- Indiana Gateway Project #5Gary · 1.2 mi away · NPDES INR10I909
- Salomon Dispatch Center #221 - GaryGary · 1.5 mi away · NPDES INR10L044
- Superior Truss And Panel, IncGary · 1.6 mi away · NPDES INR10I100
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-10-12
Monitoring stations: 1