Lac Saint-Louis
Higher than usualWater level is higher than usual for mid-September and falling.
Low (20.13m)Normal rangeHigh (21.78m)
Current Weather
Sep 2016°CMostly Cloudy
Wind NW 4 km/h
Humidity 67%
Chance of showers
Environment Canada — Metro Montréal - Laval
vs. Last Year
No data available
7-Day Trend
↓Falling
Down 5.0 cm over the past week
-5.0 cm over 7 days
Seasonal Position
81st percentile
Based on 109 years of records
Seasonal Outlook
Typical next 7 days
This lake usually drops slightly over the next week.
Typical next 14 days
Over two weeks, levels typically holds steady.
Tracking
This year is moving slower than usual.
Based on 108 years of seasonal patterns. This is a historical seasonal pattern, not a forecast.
Fish Consumption Advisories (8 species)
The following consumption advisories are in effect for fish caught in Lac Saint-Louis.
Achigan
| Contaminant | Size | General pop. | Sensitive pop. |
|---|---|---|---|
| Mercure | 25–30 cm | 8/month | — |
| Mercure | 30–35 cm | 8/month | — |
| Mercure | 35+ cm | 4/month | — |
Barbotte brune
| Contaminant | Size | General pop. | Sensitive pop. |
|---|---|---|---|
| Mercure | 25–30 cm | 8/month | — |
| Mercure | 30+ cm | 8/month | — |
| Mercure | 20–25 cm | 8/month | — |
Barbue de rivière
| Contaminant | Size | General pop. | Sensitive pop. |
|---|---|---|---|
| Mercure | 45–50 cm | 4/month | — |
| Mercure | 40–45 cm | 8/month | — |
| Mercure | 50+ cm | 8/month | — |
Doré jaune
| Contaminant | Size | General pop. | Sensitive pop. |
|---|---|---|---|
| Mercure | 50+ cm | 2/month | — |
| Mercure | 30–40 cm | 8/month | — |
| Mercure | 40–50 cm | 8/month | — |
Grand brochet
| Contaminant | Size | General pop. | Sensitive pop. |
|---|---|---|---|
| Mercure | 40–55 cm | 8/month | — |
| Mercure | 55–70 cm | 4/month | — |
| Mercure | 70+ cm | 4/month | — |
Meunier noir
| Contaminant | Size | General pop. | Sensitive pop. |
|---|---|---|---|
| Mercure | 30–35 cm | 8/month | — |
| Mercure | 40+ cm | 8/month | — |
| Mercure | 35–40 cm | 8/month | — |
Perchaude
| Contaminant | Size | General pop. | Sensitive pop. |
|---|---|---|---|
| Mercure | 20–25 cm | 8/month | — |
| Mercure | 25+ cm | 8/month | — |
| Mercure | 15–20 cm | 8/month | — |
Tanche
| Contaminant | Size | General pop. | Sensitive pop. |
|---|---|---|---|
| Mercure | 30–40 cm | 8/month | — |
| Mercure | 40–50 cm | 8/month | — |
Source: Guide de consommation du poisson (MELCCFP) (2025). Advisory data is updated annually.
Water Level — Last 30 Days
Technical details
- Current level
- 21.33 m
- Reference value
- 21.33 m (rolling_6h_mean)
- Percentile for date
- 81st percentile
- Years of record
- 109
- Source station
- SAINT-LOUIS (LAC) A POINTE-CLAIRE (02OA039)
- Est. average depth
- —
- Relationship type
- direct_lake
- Mapping confidence
- medium
- Today's normal range
- 20.71–21.23 m
- Same-date historical range
- 20.13–21.78 m
- 30-day change
- +13.7 cm
- Data confidence
- medium
- Observed at
- Sep 20, 2026
- Last snapshot
- Sep 20, 2026
Data source: ECCC Water Office — Station 02OA039. Water level readings are provisional and subject to revision. This is not a navigation or flood-warning service.