Christiana Lake
Cass County, Michigan197 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
↓ down from B at the last regrade
- Mesotrophic
- Impaired · Mercury
- #4 of 10 in the county
- 40 ft max depth
Christiana Lake in Cass County, Michigan has a water quality grade of A (Excellent). Water clarity: 8 ft visibility. Phosphorus: 21 µg/L. Chlorophyll-a (algae): 6.6 µg/L. Maximum depth: 40 ft. Surface area: 197.1 acres.
- Clarity
- 8 ft
- Typical in September
- 66°F
- Max depth
- 40 ft
- Area
- 197 acres
- Type
- Mesotrophic
- Phosphorus
- 21 µg/L
- Chlorophyll-a
- 6.6 µg/L
- Trend
- → Stable
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Watch Christiana Lake’s letter
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Christiana Lake is a 197-acre mesotrophic lake in Cass County, Michigan with a maximum depth of 40 feet. Water quality is graded A based on 2 sampling years through 2023. Water clarity is improving over recent sampling years. Compared to the 9 other monitored lakes in Cass County, Christiana Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-09-16. Grade methodology: LakeQuality methodology.
What Christiana Lake is good for
From access and monitoring records, not editorial picks.
- Deep water40 ft surveyed max depth
Swimming Safety
Grade onlyLow algae
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 A is nutrients and algae, not a swimming clearance. Christiana Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, oxygen depletion (low DO). Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Moderate clarity, visible to about 8 ft. Phosphorus 21 µg/L. Chlorophyll-a 6.6 µg/L. TSI 48. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | Not graded |
| Phosphorus | 21 µg/L | Good |
| Chlorophyll-a (Algae) | 6.6 µg/L | Good |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Christiana Lake typically sits around 66°F at the surface in September. Summer average is about 66°F. Usually warmest in Aug (about 68°F) and coldest in May (about 57°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 502 field readings (2012–2022) via the EPA Water Quality Portal. See the full Christiana Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 40 ft |
| Surface Area | 197 acres |
Fishing Christiana Lake
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.275 m/yr | 6 |
| Phosphorus | → Stable | +0.29 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +0.9 µg/L/yr | 4 |
EPA Impairment Status
Christiana Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040500011403-02 · Official waterbody report · Matched by proximity (0.44 km)
County Ranking
Ranked #4 of 10 lakes in Cass County
Nearby Lakes in Cass County
Frequently asked questions about Christiana Lake
Where is Christiana Lake?
- Christiana Lake is a lake in Cass County, Michigan. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Christiana Lake?
- Christiana Lake in Cass County, Michigan has a water quality grade of A (Excellent). Water clarity: 8 ft visibility. Phosphorus: 21 µg/L. Chlorophyll-a (algae): 6.6 µg/L. Maximum depth: 40 ft. Surface area: 197.1 acres.
Is Christiana Lake safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Christiana Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, oxygen depletion (low DO). Check local advisories before you swim.
What is the water temperature of Christiana Lake?
- Christiana Lake typically sits around 66°F at the surface in September, from 502 EPA Water Quality Portal field readings (2012–2022). That is a typical value for the month, not a live reading.
How deep is Christiana Lake?
- Christiana Lake has a maximum depth of 40 feet. The lake covers 197.1 acres.
Explore Christiana Lake across LakeQuality
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Where this data comes from
100 measurements from 1 monitoring station, 2016–2023. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS100 samples · 2016–2023
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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