Ctmc Lake
Cullman County, AlabamaView mapDirections
Nutrients and algae run above the regional average.
↓ down from C at the last regrade
- Eutrophic
- Impaired · Ammonia
- #2 of 2 in the county
Ctmc Lake in Cullman County, Alabama has a water quality grade of D (Nutrient-rich). Water clarity: 5.4 ft visibility. Phosphorus: 28 µg/L. Chlorophyll-a (algae): 17.1 µg/L.
- Clarity
- 5.4 ft
- Type
- Eutrophic
- Phosphorus
- 28 µg/L
- Chlorophyll-a
- 17.1 µg/L
Stays via Stay22
Stays near Ctmc Lake
Compare lakeside cabins, hotels, and vacation rentals near Ctmc Lake in Cullman County, Alabama — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Ctmc Lake are listed below.
Top-rated places to stay near Ctmc Lake
Prices for Sep 11–13, 4 adults. Change dates on the map below.
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Watch Ctmc Lake’s letter
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Ctmc Lake is a productive, nutrient-rich eutrophic lake in Cullman County, Alabama. Water quality is graded D based on 2 sampling years through 2024. Compared to the 1 other monitored lakes in Cullman County, Ctmc Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, ADEM, last sampled 2024-09-18. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyAlgae risk
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 D is nutrients and algae, not a swimming clearance. Ctmc Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for ammonia, oxygen depletion (low DO). Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
Murky, only visible to about 5.4 ft. Phosphorus 28 µg/L. Chlorophyll-a 17.1 µg/L. TSI 54. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.4 ft | Not graded |
| Phosphorus | 28 µg/L | Fair |
| Chlorophyll-a (Algae) | 17.1 µg/L | Poor |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Ctmc Lake
EPA Impairment Status
Ctmc Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit AL03160109-0104-102 · Official waterbody report · Matched by proximity (2.23 km)
County Ranking
Ranked #2 of 2 lakes in Cullman County
Nearby Lakes With Higher Grades
Ctmc Lake holds Grade D. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Cullman County
Frequently asked questions about Ctmc Lake
Where is Ctmc Lake?
- Ctmc Lake is a lake in Cullman County, Alabama. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Ctmc Lake?
- Ctmc Lake in Cullman County, Alabama has a water quality grade of D (Nutrient-rich). Water clarity: 5.4 ft visibility. Phosphorus: 28 µg/L. Chlorophyll-a (algae): 17.1 µg/L.
Is Ctmc Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Ctmc Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for ammonia, oxygen depletion (low DO). Check local advisories before you swim.
Explore Ctmc Lake across LakeQuality
More Alabama Lake Rankings
Other Grade D Lakes in Alabama
Where this data comes from
100 measurements from 2 monitoring stations, 2017–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- ALABAMA DEPT. OF ENVIRONMENTAL MANAGEMENT - WATER QUALITY DATA
21AWIC100 samples · 2017–2024
Analytical methods
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
Monitoring station identifiers (2)
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