Lake Twenty (Aka
Gladwin County, Michigan128 acresView mapDirections
EGLE publishes the water-quality measurements for Lake Twenty (Aka. Here is what has been measured.
- Mesotrophic
- Limited data
Ask about Lake Twenty (Aka
Answers come straight from the public measurements and survey records on this page.
Lake Twenty (Aka in Gladwin County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 8.5 ft visibility. Phosphorus: 20.5 µg/L. Chlorophyll-a (algae): 2.7 µg/L. Surface area: 128 acres.
Stays via Stay22
Stays near Lake Twenty (Aka
Compare lakeside cabins, hotels, and vacation rentals near Lake Twenty (Aka in Gladwin County, Michigan — 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.
Top-rated places to stay near Lake Twenty (Aka
Prices for Sep 18–20, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Michigan’s top lakes →
Follow Lake Twenty (Aka’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Lake Twenty (Aka is a 128-acre mesotrophic lake in Gladwin County, Michigan. Overall water quality is improving over recent sampling years. Compared to the 4 other monitored lakes in Gladwin County, Lake Twenty (Aka ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-09-14. Grade methodology: LakeQuality methodology.
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 Lake Twenty (Aka 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 Lake Twenty (Aka
These are the measurements EGLE publishes for Lake Twenty (Aka, 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 8.5 ft. Phosphorus 20.5 µg/L. Chlorophyll-a 2.7 µg/L. TSI 45.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.5 ft | Measured, not scored |
| Phosphorus | 20.5 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | 2.7 µg/L | Good |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 128 acres |
No bathymetric survey has been published for Lake Twenty (Aka, so its depth is not documented here.
Fishing Lake Twenty (Aka
Water Quality Trend: ↑ Improving
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.27 m/yr | 8 |
| Phosphorus | ↓ Declining | +1.5 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -0.9 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Lake Twenty (Aka 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 (0.75 km)
Nearby Lakes in Gladwin County
Frequently asked questions about Lake Twenty (Aka
Where is Lake Twenty (Aka?
- Lake Twenty (Aka 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 Lake Twenty (Aka?
- Lake Twenty (Aka in Gladwin County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 8.5 ft visibility. Phosphorus: 20.5 µg/L. Chlorophyll-a (algae): 2.7 µg/L. Surface area: 128 acres.
Is Lake Twenty (Aka safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Lake Twenty (Aka across LakeQuality
Fish species and the cleanest lakes across Michigan
Species activity outlook by water temperature and season
Where to stay at Michigan's top lakes, each with its readings
Michigan's cleanest lakes, ranked on agency measurements
More lakes in Michigan
Other Lakes in Michigan
Mesotrophic Lakes in Michigan
Where this data comes from
129 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_MICORPS129 samples · 2016–2023
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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.