Grand Calumet Lagoon Lake
Lake County, IndianaView mapDirections
IDEM publishes the water-quality measurements for Grand Calumet Lagoon Lake. Here is what has been measured.
- Mesotrophic
- Limited data
Grand Calumet Lagoon Lake in Lake County, Indiana has water-quality measurements published by IDEM, shown here as reported. Phosphorus: 39 µg/L. Chlorophyll-a (algae): 3.1 µg/L.
Grand Calumet Lagoon Lake is a mesotrophic lake in Lake County, Indiana. 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. Methodology: how these readings are compared.
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Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Grand Calumet Lagoon Lake is safe to swim in today is a call for the Indiana Department of Environmental Management and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Grand Calumet Lagoon Lake
These are the measurements IDEM publishes for Grand Calumet Lagoon 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. Phosphorus 39 µg/L. Chlorophyll-a 3.1 µg/L. TSI 49.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 39µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | 3.1µg/L | Measured, not scored 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. | 49 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Grand Calumet Lagoon Lake
Answers come straight from the public measurements and survey records on this page.
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.
Column height runs from this lake’s coldest month (68°F) to its warmest (80°F).
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 →
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Stays near Grand Calumet Lagoon Lake
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Fishing Grand Calumet Lagoon Lake
Water quality readings over time
3 seasons of samples on record (2020–2024). Calling a direction takes at least 4 years of the same measurement.
Phosphorus
Worsening+3.05 µg/L/yr3 years
Chlorophyll-a
Improving-1.1 µg/L/yr2 years
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.
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. Its water-quality measurements are published by IDEM and shown on this page as reported.
What is the water quality of Grand Calumet Lagoon Lake?
- Grand Calumet Lagoon Lake in Lake County, Indiana has water-quality measurements published by IDEM, shown here as reported. Phosphorus: 39 µg/L. Chlorophyll-a (algae): 3.1 µg/L.
Is Grand Calumet Lagoon Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. 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 lakes in Indiana
Other Lakes in Indiana
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)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)