Little Lake Twenty
Gladwin County, Michigan128 acresView mapDirections
EGLE publishes the water-quality measurements for Little Lake Twenty. Here is what has been measured.
- Limited data
Little Lake Twenty in Gladwin County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 9 ft visibility. Surface area: 128 acres.
Little Lake Twenty is a 128-acre lake in Gladwin County, Michigan. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-10. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Little Lake Twenty is safe to swim in today is a call for the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Little Lake Twenty
These are the measurements EGLE publishes for Little Lake Twenty, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 9 ft. TSI 45.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading 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. | 45 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Little Lake Twenty
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Lake Details
Surface area
128 acres
No bathymetric survey has been published for Little Lake Twenty, so its depth is not documented here.
Stays via Stay22
Stays near Little Lake Twenty
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Fishing Little Lake Twenty
Water Quality Trend: Improving
Based on 8 years of monitoring (2016–2023).
Water clarity
Improving8 years
Phosphorus
Worsening+1.5 µg/L/yr2 years
Chlorophyll-a
Improving-0.9 µg/L/yr2 years
Reservoir Info (USACE NID)
Little Lake Twenty is a man-made reservoir impounded by the Scottish Hills Lake Dam (completed 1974), built primarily for recreation on the Lake Twenty Outlet; earth-type dam, 14 ft tall and 200 ft long.
- Surface area
- 128 ac
- Normal storage
- 1,350 ac-ft
- Max storage
- 2,100 ac-ft
- Drainage area
- 3.6 sq mi
- Hazard class
- Low
- Owner
- Scottish Hills Condominium Assn
Source: USACE National Inventory of Dams, NID ID MI00656 · Operator website · Matched by proximity (0.72 km)
Nearby Lakes in Gladwin County
Frequently asked questions about Little Lake Twenty
Where is Little Lake Twenty?
- Little Lake Twenty is a lake in Gladwin County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Little Lake Twenty?
- Little Lake Twenty in Gladwin County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 9 ft visibility. Surface area: 128 acres.
Is Little Lake Twenty safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
104 measurements from 1 monitoring station, 2016–2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS104 samples · 2016–2022
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.