Grand Calumet Lagoon Lake
Lake County, IndianaView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from B at the last regrade
- Mesotrophic
- Impaired · PCBs
- #4 of 5 in the county
- Limited data
Grand Calumet Lagoon Lake in Lake County, Indiana has a water quality grade of C (Fair). Phosphorus: 39 µg/L. Chlorophyll-a (algae): 3.1 µg/L.
- Typical in September
- 68°F
- Type
- Mesotrophic
- Phosphorus
- 39 µg/L
- Chlorophyll-a
- 3.1 µg/L
- Trend
- → Stable
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Stays near Grand Calumet Lagoon Lake
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Watch Grand Calumet Lagoon Lake’s letter
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Grand Calumet Lagoon Lake is a mesotrophic lake in Lake County, Indiana. Water quality is graded C based on 1 sampling years through 2022. Phosphorus level is declining over recent sampling years. Compared to the 4 other monitored lakes in Lake County, Grand Calumet Lagoon Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, IDEM, last sampled 2022-09-15. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The C is nutrients and algae, not a swimming clearance. Grand Calumet Lagoon Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pCBs. Check local advisories before you swim.
Water Quality Grade: C (Fair)
No clarity data. Phosphorus 39 µg/L. Chlorophyll-a 3.1 µg/L. TSI 49. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 39 µg/L | Fair |
| Chlorophyll-a (Algae) | 3.1 µg/L | Not graded |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Grand Calumet Lagoon Lake typically sits around 68°F at the surface in September. Summer average is about 78°F. 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 →
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 | +3.05 µg/L/yr | 3 |
| Chlorophyll-a | ↑ Improving | -1.1 µg/L/yr | 2 |
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)
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.
County Ranking
Ranked #4 of 5 lakes in Lake County
Nearby Lakes in Lake County
Frequently asked questions about Grand Calumet Lagoon Lake
Where is Grand Calumet Lagoon Lake?
- Grand Calumet Lagoon Lake is a lake in Lake County, Indiana. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Grand Calumet Lagoon Lake?
- Grand Calumet Lagoon Lake in Lake County, Indiana has a water quality grade of C (Fair). Phosphorus: 39 µg/L. Chlorophyll-a (algae): 3.1 µg/L.
Is Grand Calumet Lagoon Lake safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Grand Calumet Lagoon Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pCBs. Check local advisories before you swim.
What is the water temperature of Grand Calumet Lagoon Lake?
- Grand Calumet Lagoon Lake typically sits around 68°F at the surface in September, from 19 EPA Water Quality Portal field readings (2013–2022). That is a typical value for the month, not a live reading.
Explore Grand Calumet Lagoon Lake across LakeQuality
Planning a trip around Indiana Dunes?
Grand Calumet Lagoon Lake is about 9 miles from Indiana Dunes National Park. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Indiana Dunes →More Indiana Lake Rankings
Mesotrophic Lakes in Indiana
Where this data comes from
17 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Indiana Water Science Center
USGS-IN17 samples · 2021–2022
Analytical methods
- P, wu, WCA, persulfate CF color
- Plant pigments, sonication & 445
- YSI Environmental, sensor 6136
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)