Lac Long
47.4134° N, 68.9288° W
Depth contours from the 1974 government survey. Not for navigation.
Download the depth map (SVG)Lac Long, Quebec. 47.4134° N, 68.9288° W
Maximum depth 25.9 m (1974 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/lac-long-near-pohenegamook/, compiled October 9, 2026
- Canadian Geographical Names Database, Natural Resources Canada. Contains information licensed under the Open Government Licence – Canada.
- HydroLAKES v1.0, Messager et al. 2016 / WWF HydroSHEDS. Licensed under CC BY 4.0.
- Census boundaries and population, 2021, Statistics Canada. Adapted from Statistics Canada. This does not constitute an endorsement by Statistics Canada.
- Géobase des bathymétries de lac du Québec (GBLQ), Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs. Licensed under CC BY 4.0. Source: Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (MELCCFP), Données Québec.
- États trophiques des lacs (RSVL), Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs. Licensed under CC BY 4.0. Source: Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (MELCCFP), Données Québec.
- City page weather forecasts and alerts, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
- Air Quality Health Index observations and forecasts, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
- Photographs, Wikimedia Commons contributors. Each photo carries its own licence (CC0, public domain, CC BY or CC BY-SA), credited where shown.
Lac Long is 25.9 m deep at its deepest point, deeper than 76% of the 1,506 surveyed lakes in Quebec. It covers 9.9 km² and lies beside Les Étroits.
- Maximum depth
- 25.9 msurveyed 1974
- deeper than 76% of the 1,506 surveyed lakes in Quebec
- Area
- 9.9 km²
- larger than 95% of the 29,407 lakes in Quebec
- Shoreline
- 52.1 km
- longer than 95% of the 29,407 lakes in Quebec
- Water clarity
- 5 mSecchi depth, 2023
- clearer than 70% of the 805 monitored lakes in Quebec
- Elevation
- 199 m
Today on the water
8.3 °C
Observed at Temiscouata, as of 4:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 5 a.m., wind from the west: the west shore is sheltered, waves build toward the east shore.
| Time | 5 a.m. | 8 a.m. | 11 a.m. | 2 p.m. | 5 p.m. | 8 p.m. | 11 p.m. | 2 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 15 | W 15 | NW 20 | NW 20 | NW 20 | W 20 | W 20 | W 20 |
| Gusts km/h | 40 | 40 | 40 | |||||
| Waves (est.) m | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |||
| Temp. °C | 4 | 6 | 9 | 9 | 5 | 4 | 3 | 3 |
| Precip. % | 0 | 0 | 30 | 30 | 30 | 0 | 0 | 0 |
Tonight: A few showers ending this evening then partly cloudy. Risk of a thunderstorm early this evening. Low plus 4.
Weather: Temiscouata (local forecast), as of 4:01 a.m. EDT
Sun and moon
- Civil dawn
- 6:15 a.m.
- Sunrise
- 6:45 a.m.
- Sunset
- 5:59 p.m.
- Civil dusk
- 6:29 p.m.
- Moonrise
- 5:35 a.m.
- Moonset
- 5:17 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
1 low risk
Edmundston, as of 4:00 a.m. EDT
Follow this lake by email: a weekly summary of conditions.
Depth
20% of Lac Long is shallower than 3 m, and 25% is deeper than 10 m.
How to read it: the lake’s area is sorted from the shore to the deepest point. Where the curve is flat, large areas share one depth (flats and weed beds); where it drops, depth changes quickly (drop-offs).
The government depth survey from 1974 records a maximum depth of 25.9 m, drawn from 91 depth contours.
- Download the depth map (SVG)Printing this page gives the map on one sheet, with scale and sources.
- Official government depth map (PDF)
Not for navigation. Depths are from government surveys and may be outdated.
Water
Trophic status from the latest monitoring: oligo-mesotrophic (transition).
Clarity was measured with a Secchi disk in 6 years between 2016 and 2023; the latest annual mean is 5 m.
Photos
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.