Mair Lake
160 ft
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Depth scale
Survey readout
Mair Lake is mapped to a depth of 48.8 m (160 ft) on the Ontario MNRF survey and covers about 50 ha (123 acres) in Frontenac County, Ontario.
Measured from the Ontario MNRF bathymetry survey.
- Deepest mapped contour
- 48.8 m (160 ft)
- Surface area
- 50 ha (123 acres)
- Shoreline
- 5.3 km (3.3 mi) · irregular
- Fishing access
- 2 MNRF fishing access points · 2 boat launches
Additional depth details14 contours
- Contour depths
- 0–48.8 m (160 ft)
- Deep-spot markers
- 48.8 m (160 ft), 12.2 m (40 ft)
Provenance
Sources: Ontario MNRF / LIO Bathymetry, Ontario FRI Leaf-On Imagery, Ontario FRI LiDAR DTM, OpenStreetMap (ODbL), Contains information licensed under the Open Government Licence – Ontario.
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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 Ontario LiDAR (FRI DTM) elevation, with a Ontario FRI aerial basemap and OpenStreetMap shoreline. Colour shows surveyed depth; dark lines are the survey's own isobaths.
- Coordinates
- 45.10910, -76.83012
- MNRF lake ID
- 18-3559-49965
- Vertical exaggeration
- 1.4×
- Basemap
- Ontario FRI
- Model size
- 1.3 MB
Check the source: this lake’s record (18-3559-49965) in the Ontario MNRF bathymetry index, and the contour line layer the map is drawn from (Land Information Ontario open data, Open Government Licence – Ontario). Survey year: not recorded in the source. This model was built 2026-09-06. Depths between contours are interpolated, not measured.
Paddling
Paddling Index methodology v1.0 · calculated 2026-09-16Mair Lake has a heavily wooded and largely undeveloped setting, generally sheltered geometry, little nearby major-road exposure.
Why this score?5 components
Included in the index
| Component | Rating | Points of weight | Measurement |
|---|---|---|---|
| Natural setting | Excellent | 31.5 of 35 | 92% natural land cover within 150 m of shore (88% forest, 2% wetland; 4% developed) |
| Geometric wind exposure | Very Good | 22.9 of 29 | mean fetch 695 m · 8% of sampled water within 500 m of shelter · generally short fetch |
| Motor & speed rules | Not modelled | — | Canada publishes vessel motor and speed restrictions as federal legal schedules, not map data, so they are not part of the Ontario index. Check local signage and Transport Canada rules before going out. |
| Public access | Good | 15.0 of 18 | 2 MNRF fishing access points · boat ramp |
| Road isolation | Excellent | 16.5 of 18 | relatively isolated from major roads · 1 Ontario Road Network segment within 1.2 km (traffic estimated from road class, not measured) |
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
- 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
- High — 88% forest and 2% wetland cover within 150 m of shore
- Mapped wildlife habitat
- Mapped — Ontario MNRF has mapped moose aquatic feeding areas, moose wintering area and deer wintering area within 1 km of this lake. These are habitat records from provincial surveys, not animal counts; areas with nothing mapped may still hold wildlife. · Ontario MNRF Wildlife Values Area. Contains information licensed under the Open Government Licence – Ontario.
Compare Ontario lakes by Paddling Index →
Angler catch reports
Fish ON-Line · 2015–2024What anglers say they caught here, logged trip by trip in Ontario’s Fish ON-Line app — most recently in September 2024.
Pictures are sized relative to each other. Illustrations are AI-generated representative adults in everyday colours, not photographs (provenance).
How people fish it: boat 100%
Catch rate: about 1.4 fish an hour, all species together (16 trips, 91 hours logged)
Kept: 40% of the fish reported; the rest were released
About these fish → the Fish of Ontario guide
Mair Lake — common questions
How deep is Mair Lake?
The deepest contour on the Ontario MNRF bathymetric survey of Mair Lake is 48.8 m (160 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 Mair Lake?
Mair Lake covers about 50 ha (123 acres) in Frontenac County, Ontario.
Is there public access to Mair Lake?
The Ontario MNRF lists 2 fishing access points within 100 m of the shoreline of Mair Lake: 2 boat launches. Recorded ownership: 1 provincial. The list includes municipal and privately owned sites, and some may charge a fee or restrict parking, so it confirms a place anglers use rather than a public right of way. Check locally before you go.
