Au Train Lake
depth
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Depth scale
Survey readout
Au Train Lake is mapped to a depth of 30 ft on the Michigan DNR survey and covers about 838 acres in Alger County, Michigan.
Measured from the Michigan DNR inland-lake contour survey.
- Deepest mapped contour
- 30 ft
- Mean depth
- 11.8 ft · estimated
- Surface area
- 838 acres
- Estimated volume
- 9,899 acre-ft · 3,226M gal
- Shoreline
- 6.82 mi · irregular
- Aquatic vegetation
- 3% of surface · NDVI estimate
- Trophic state
- Mesotrophic · satellite estimate · readings disagree · details
- Public access
- Boat Launch
- Borders
- Hiawatha National Forest · U.S. Forest Service · 33% of shoreline
Additional depth details6 contours
- Contour depths
- 0–30 ft
- Recorded point soundings
- 30 ft
38.9% of the surface sits over water shallower than 10 ft; 12% is deeper than 20 ft. Depth, area and volume are estimated from the interpolated survey surface — historical reference, not measurement.
Compare with another lakeProvenance
Sources: MI DNR inland lake contours, USGS 3DEP, USDA NAIP (public domain), OpenStreetMap (ODbL), MI DNR Boat Launches.
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Map details & sources5 sources
All layers registered to one bounding box; positions in WGS 84.
Survey-derived depth contours drape over USGS 3DEP elevation, with a USDA NAIP aerial basemap and OpenStreetMap shoreline. Color shows surveyed depth; dark lines are the survey's own isobaths.
- Coordinates
- 46.40003, -86.84211
- MI DNR lake ID
- L34671
- Vertical exaggeration
- 2.66×
- Basemap
- USDA NAIP · public domain
- Model size
- 2.7 MB
Lake productivity & trophic state
Satellite estimateSatellite-estimated classification: Mesotrophic. Moderate nutrient levels and biological productivity. Based on satellite estimates of summer chlorophyll-a (LAGOS-US LANDSAT, 2020). No lake-specific measurement is available in this dataset.Field and satellite readings disagree for this lake: a Secchi disk water-clarity reading of 7.5 ft was recorded in 2005, while the satellite estimate is 10 ft. Treat the satellite-estimated classification with caution.
Trophic state describes how biologically productive a lake is, based on indicators such as nutrients, algae and water clarity. It is not a swimming-safety or overall water-quality rating.
What do the categories mean?
- Oligotrophic≤ 2 µg/L · lower nutrient and algae levels, often clearer water and lower biological productivity.
- Mesotrophic · this lake2–7 µg/L · moderate nutrient levels and biological productivity.
- Eutrophic7–30 µg/L · higher nutrient levels and biological productivity, often with more algae or aquatic plant growth.
- Hypereutrophic> 30 µg/L · very high nutrient levels and biological productivity, with a greater potential for heavy algae growth and low water clarity.
Bands are summer (June–August) mean chlorophyll-a, the green pigment in algae, at the EPA 2012 National Lakes Assessment thresholds. Trophic condition can change over time and by measurement method. Source: Midwest Glacial Lakes Partnership Conservation Planner; satellite chlorophyll-a estimates from LAGOS-US LANDSAT.
Paddling
Paddling Index methodology v1.0 · calculated 2026-09-23Au Train Lake has a partly natural setting, moderate open-water exposure, some nearby classified roads. No special watercraft restriction is identified in the current source.
Why this score?5 components
Included in the index
| Component | Rating | Points of weight | Measurement |
|---|---|---|---|
| Natural setting | Good | 20.0 of 35 | 63% natural land cover within 150 m of shore (27% forest, 36% wetland; 25% developed) |
| Geometric wind exposure | Good | 10.1 of 29 | mean fetch 1,960 m · 0% of sampled water within 500 m of shelter · moderate open-water fetch |
| Watercraft controls | None identified | 8.8 of 18 | No special watercraft restriction identified in the current DNR source. Motors permitted, subject to general law. |
| Public access | Not listed | — | No DNR-listed access site. Township, county and road-end launches are not in this source, so this is not evidence that access is poor — the component is excluded and the remaining weights are renormalized. |
| Road isolation | Good | 8.4 of 18 | some nearby classified roads · 22 MDOT-classified segments within 1.2 km, peak 1,007 vehicles/day |
Additional paddling considerations
These describe the lake but are not part of the v1 Paddling Index and do not change the number above.
- Wake sensitivity
- Low — wide enough that wakes disperse over most of the lake
- Aquatic vegetation
- Low — approximately 3% mapped coverage · NAIP aerial imagery (NDVI)
- Observed motorized activity
- Unknown — No lake-level measurement of boat traffic is available. Legal permission to operate motors is not evidence of use.
- Wildlife habitat potential
- Moderate — 27% forest and 36% wetland cover within 150 m of shore
Compare Michigan lakes by Paddling Index →
Fish you might catch
from angler catches, DNR surveys & active stocking13 species with recent evidence in this lake — sized relative to each other. Illustrations are AI-generated representative adults in everyday colors, not photographs (provenance).
About these fish → the Fish of Michigan guide
Historically stocked, no recent evidence: Tiger Muskellunge (last planted 1990) — not shown above.
Fishing rules for this lake Beta
Size and daily limits for the 13 species found here — 12 open to harvest, 1 with a special rule or closed season.
These are hook-and-line size, daily limit and season rules. Gear, spearing and bow fishing, spawning closures and rod limits are set by other Fisheries Orders and are not shown here.
Official rule text for this lake
“no size limit on Northern Pike and up to five (5) Northern Pike may be retained in the daily possession limit with only one (1) 24- inches or greater.” — FO-206
From FO-206.26 (eff. 2026-04-01) / FO-215.23A (eff. 2023-09-15) / FO-254.25 (eff. 2025-10-10), checked against the 2026 Michigan Fishing Regulations digest · verified 2026-09-15. Regulations can change — Michigan DNR rules are the controlling source; verify current regulations before fishing. Official regulations
Notable catches
Master Angler program · 1997–2024Trophy-size fish anglers caught here and registered with the DNR — what people have actually caught, distinct from what a survey netted or the state stocked below.
Catch details by species10 species
Biggest on record
Bait: artificial lure (3) · live bait (2) · minnow (2)
Method: still fishing (6) · spincasting (4) · ice fishing (4) · trolling (3)
Fishery
Panfish
Bullhead & catfish
Forage & nongame
DNR stocking
state stocking record · 1979–2026Fish the Michigan DNR has planted in this lake — what was added, distinct from what a survey netted above.
Complete stocking history3 older species
Non-native species records
3 recordsMussels & snails
Plants & algae
How to identify invasive species in Michigan lakes →
What does non-native mean?
USGS records identify non-native species that have been documented for this lake or its shoreline. Non-native does not necessarily mean invasive, and historical records do not confirm current presence.
Source: Midwest Glacial Lakes Partnership Conservation Planner; underlying nonindigenous species records from the USGS Nonindigenous Aquatic Species database.
At the lake
community-mapped amenities · straight-line distanceBait & tackle nearby
licensed retail bait dealers · straight-line distanceAu Train Lake — common questions
How deep is Au Train Lake?
The deepest contour on the Michigan DNR bathymetric survey of Au Train Lake is 30 ft. That is the deepest depth the historical survey map records, which may differ from the deepest point of the lake itself.
How big is Au Train Lake?
Au Train Lake covers about 838 acres in Alger County, Michigan.
What is the average depth of Au Train Lake?
The estimated mean depth of Au Train Lake is 11.8 ft, calculated from the survey contours.
What fish are in Au Train Lake?
Species with survey, catch or recent-stocking evidence include brown trout, largemouth bass, northern pike, smallmouth bass, walleye, brown bullhead. The page lists all 13 species and the evidence behind each.
Is there public access to Au Train Lake?
Yes. The Michigan DNR boat-launch data identifies 1 public access site on Au Train Lake, including Au Train Lake.
