Timmerman Lake; Deep Basin; Norman Township
Timmerman Lake; Deep Basin; Norman Township in Manistee County, Michigan has a water quality grade of A (Excellent). Water clarity: 5 ft visibility. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 6.9 µg/L. Maximum depth: 31 ft.
- Clarity
- 5 ft
- Max depth
- 31 ft
- Type
- Mesotrophic
- Trend
- ↓ Declining
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Timmerman Lake; Deep Basin; Norman Township is a mesotrophic lake in Manistee County, Michigan with a maximum depth of 31 feet. Water quality is graded A based on 1 sampling years through 2018. Overall water quality is declining over recent sampling years. Compared to the 12 other monitored lakes in Manistee County, Timmerman Lake; Deep Basin; Norman Township ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2018-09-04. Grade methodology: LakeQuality methodology.
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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.
Excellent for swimming, crystal clear water with minimal algae
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Water Quality Grade: A (Excellent)
Murky, only visible to about 5 ft. Phosphorus level: 13 µg/L. Chlorophyll-a: 6.9 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | Not graded |
| Phosphorus | 13 µg/L | Not graded |
| Chlorophyll-a (Algae) | 6.9 µg/L | Good |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Timmerman Lake; Deep Basin; Norman Township
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 31 ft |
Fishing Timmerman Lake; Deep Basin; Norman Township
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.15 m/yr | 2 |
County Ranking
Ranked #5 of 13 lakes in Manistee County
Nearby Lakes in Manistee County
Frequently asked questions about Timmerman Lake; Deep Basin; Norman Township
Where is Timmerman Lake; Deep Basin; Norman Township?
- Timmerman Lake; Deep Basin; Norman Township is a lake in Manistee County, Michigan. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Timmerman Lake; Deep Basin; Norman Township?
- Timmerman Lake; Deep Basin; Norman Township in Manistee County, Michigan has a water quality grade of A (Excellent). Water clarity: 5 ft visibility. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 6.9 µg/L. Maximum depth: 31 ft.
Is Timmerman Lake; Deep Basin; Norman Township safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Timmerman Lake; Deep Basin; Norman Township has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 6.9 µg/L. Always check local health department advisories before swimming.
How deep is Timmerman Lake; Deep Basin; Norman Township?
- Timmerman Lake; Deep Basin; Norman Township has a maximum depth of 31 feet.
Explore Timmerman Lake; Deep Basin; Norman Township across LakeQuality
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Moderate nutrients, good water quality
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Other Grade A Lakes in Michigan
Lake County · 5.5 ft
Lake County · 13 ft
Lake County · 14.5 ft
Lake County · 18.3 ft
Mason County · 14 ft
Lake County · 9 ft
Mesotrophic Lakes in Michigan
Where this data comes from
22 measurements from 1 monitoring station, 2017–2018. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS22 samples · 2017–2018
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.