Register: which ER is least loaded, hour by hour (island of Montréal)
Window: 161 consecutive comparable hours, 2 September 2026 23:00 to 9 September 2026 17:00. An hour counts as comparable when all five facilities have a published occupancy rate. Source: the MSSS hourly readings, kept here since 10 August 2026.
Occupancy rate over the window
| Facility | Minimum | Median | Maximum |
|---|---|---|---|
| Royal Victoria Hospital | 176 % | 203 % | 245 % |
| Lachine Hospital | 50 % | 107 % | 193 % |
| Notre-Dame Hospital | 97 % | 129 % | 154 % |
| Montreal General Hospital | 142 % | 168 % | 200 % |
| Lakeshore General Hospital | 145 % | 190 % | 235 % |
Hours spent at the lowest occupancy of the five
| Facility | Hours of 161 |
|---|---|
| Lachine Hospital | 123 |
| Notre-Dame Hospital | 37 |
| Montreal General Hospital | 1 |
Hours spent at the fewest people waiting to be seen
| Facility | Hours of 161 |
|---|---|
| Lachine Hospital | 102 |
| Notre-Dame Hospital | 28 |
| Montreal General Hospital | 26 |
| Lakeshore General Hospital | 5 |
Agreement between the two published numbers
Stretcher occupancy and people waiting to be seen name the same least-loaded ER 82 hours out of 161. Two different ERs in the other 79 hours.
How to redo the calculation
Every row comes from /api/facility/<permit>/history?hours=250 on this site, fields occ_pct and waiting. Permits: 51223295 Royal Victoria, 51228310 Lachine, 51236313 Notre-Dame, 51248219 Montreal General, 51228278 Lakeshore. Hours where one facility publishes nothing are dropped for all five at once.
Reading stopped at 9 September 2026, 17:00.