Dainava Bridge P-00431 in Mille-Isles — preventive closure for an indefinite period

Summary

File based on public sources consulted on September 13, 2026, including the MTMD general inspection report dated August 11, 2025. This summary does not replace the original report, an inspection, or engineering advice.

Built in 1956, Dainava Bridge P-00431 underwent a general inspection in August 2025 that documented defects in several steel components. It has been preventively closed to road traffic since September 11, 2026; the intervention and timeline remain to be documented.

Document updates

This section is not separately documented in the file retained.

Reported → Validated → Monitoring → Action

Reported → Validated → Monitoring → Action

1. Reported September 11, 2026
   

   The MTMD announces the immediate preventive closure of Dainava Bridge on Tamaracouta Road.

   Documented fact

2. Validated September 11, 2026
   

   Québec 511 lists a major disruption and a full-time closure at Dainava Road.

   Documented fact

3. Monitoring Ongoing
   

   The closure is announced for an indefinite period. The detour is via Kirkpatrick Road and Route 329.

   Documented fact

4. Action To be documented
   

   A detailed assessment of the structure, the nature of the intervention, and a reopening timeline have not been published in the sources consulted.

   Information not determined

Documented timeline

1. 1956
   

   The municipal publication devoted to Mille-Isles bridges indicates that Dainava Bridge, P-00431, was built in 1956. It describes it as a wooden bridge on steel girders spanning the Dainava Lake outlet.

   Documented fact · Municipality of Mille-Isles

2. January 16, 2008
   

   Order 1176-2007, published in the Gazette officielle du Québec, lists structure 00431 on Tamaracouta Road, over the Dainava Lake outlet, among strategic municipal bridges managed by the Minister of Transport.

   Documented fact · Gazette officielle du Québec

3. August 11, 2025
   

   The MTMD general inspection specifically notes the bearings, five girders, the bracing, and the corrosion protection of the deck’s structural steel.

   Documented fact · Ministère des Transports et de la Mobilité durable

4. August 11, 2025
   

   The report describes significant to very significant corrosion on several girders. For girder 3, it records a 1,100 mm by 70 mm web perforation at the west end and indicates defects that could very significantly reduce its load-bearing capacity.

   Documented fact · Ministère des Transports et de la Mobilité durable

5. September 11, 2026
   

   The Municipality of Morin-Heights relays an MTMD notice announcing the bridge’s immediate preventive closure due to its current condition. The closure is announced for an indefinite period.

   Documented fact · Municipality of Morin-Heights

6. September 11, 2026
   

   Québec 511 describes the work as a structural repair, with the road closed full-time in both directions and a detour via Kirkpatrick Road and Route 329.

   Documented fact · Québec 511

7. September 11, 2026
   

   The notice relayed by the Municipality specifies that pedestrians and cyclists may continue to use the bridge.

   Documented fact · Municipality of Morin-Heights, CIME

Documented fact

Facts supported by the sources

• Dainava Bridge bears the identifier P-00431 and is located on Tamaracouta Road in Mille-Isles, over the Dainava Lake outlet.
• A municipal publication indicates that the structure was built in 1956.
• The general inspection of August 11, 2025 documents section loss in the bearings as well as corrosion on several girders and braces.
• The report describes a web perforation at the west end of girder 3 and characterizes the potential effect of the defects on its load-bearing capacity.
• When the report was printed on December 17, 2025, the next general inspection was scheduled for 2027.
• The MTMD announced its immediate preventive closure on September 11, 2026, due to its current condition.
• The road closure is announced for an indefinite period.
• The indicated detour is via Kirkpatrick Road and Route 329.
• The municipal notice relaying the MTMD indicates that crossing remains permitted for pedestrians and cyclists.

Separate context

An inspection prior to the closure

The report reviewed concerns the general inspection of August 11, 2025, and was printed on December 17, 2025, nearly nine months before the road closure announced in September 2026. It documents observed defects, but the sources consulted do not establish that those findings alone were the immediate basis for the closure decision. The notation “status: closed” and the footer “general inspection closed” are treated as the status of the inspection file, not as evidence of a road closure in August 2025.

Ministère des Transports et de la Mobilité durable, Municipality of Morin-Heights

Separate context

Two municipalities in identifying the area

The structure is located within the territory of Mille-Isles. The closure notice was also published by the Municipality of Morin-Heights, which places the bridge near Kirkpatrick Road and Route 329 in Morin-Heights. This proximity explains the presence of both municipalities in the communications reviewed without changing the official location of P-00431 in Mille-Isles.

Gazette officielle du Québec, Municipality of Morin-Heights

End not confirmed

Intervention

Québec 511 links the disruption to a structural repair. However, the sources consulted specify neither the work selected, nor its schedule, nor a reopening date. These details remain to be monitored with the MTMD and the municipalities concerned.

Reading the file

The 2025 report now makes it possible to describe specific findings concerning the bearings, girders, bracing, and corrosion protection, in the terms used by the MTMD. However, this earlier inspection should not be confused with a complete explanation of the September 2026 closure. Follow-up must connect the defects already recorded to the next published decisions, without assigning a technical cause or anticipating the solution selected.

Undetermined elements

• The MTMD does not specify which findings directly prompted the preventive closure in September 2026.
• No inspection or assessment conducted after August 11, 2025, and before the closure was found in the public documents reviewed.
• The nature and scope of the work to be carried out are not confirmed.
• The work schedule and reopening date are not determined.
• No BSIR field observation, documentary photograph, or GPS coordinate is associated with this record.

Next milestone

Document the publication of a structural assessment, the nature of the selected work, its schedule, and the conditions for a possible reopening.

Sources

1. Ministère des Transports et de la Mobilité durable P-00431 — general inspection report of August 11, 2025, printed December 17, 2025 (29 pages) View source ↗
2. Municipality of Morin-Heights Immediate closure of Dainava Bridge September 11, 2026
   View source ↗
3. Québec 511 Network status — Tamaracouta Road in Mille-Isles View source ↗
4. Municipality of Mille-Isles Info Mille-Isles — The bridges of Mille-Isles, October 2023 edition October 1, 2023
   View source ↗
5. Gazette officielle du Québec Order 1176-2007 of December 19, 2007 — municipal bridges recognized as strategic January 16, 2008
   View source ↗
6. CIME A bridge is preventively closed in Morin-Heights September 11, 2026
   View source ↗

Record imported from BSIR.ca. The consultation dates and reservations from the source file have been retained.