As the Stage 3 plan is neither complete nor funded, there isn’t a lot of definitive detail.
In Stage 3 Ottawa may extend commuter rail west to Kanata and south to Barrhaven, both from the west side of Line 1 (the red line, also called the Confederation Line).
It may also extend rail to Quebec over the existing but currently unused Prince of Wales Bridge, although there is also a Gatineau proposal to create a west-end rail system in Quebec that would run across the Prince of Wales Bridge.
To some extent you can get a sense of Stage 3 from the transportation network in the 2013 Transportation Master Plan. (The Transportation Master Plan normally would have been updated in 2018, but the city wants to complete Stage 1 of the rail system first.)
This map is a vision for the future (roughly 2028-2031 timeframe). The actual network will depend on many different factors including funding and route optimisation. Red is rail (Light Rail Transit), blue is bus (Bus Rapid Transit).
Above from  Transportation Master Plan, page 123 in the full PDF document or separate map download Map 3 Rapid Transit and Transit Priority Network – Ultimate Network (PDF).
Stage 3 is still at least 5 years (2023) from being finalised and started, since Stage 2 has to complete first. Completion of Stage 3 would be something like 2028 at the earliest.
Kanata (Line 1 West)
Ottawa’s east-west commuter rail Confederation Line (Line 1) is completely grade-separated, which means that it never intersects with car traffic. This is absolutely the correct design for a high-reliability commuter rail network. When extending the network into car-designed Kanata, however, it has the unusual result of a recommendation that part of the line be elevated. Any time you put rail under the ground or elevated above ground level it’s more expensive, but I guess there are a lot of highways for the Kanata extension to cross.
The website is ottawa.ca/kanataLRT
Documents are available from the May 9, 2018 City Council:
There are also documents from August 2018 available from the kanataLRT webpage itself, but rather unusually they’re in DropBox, so caveat downloader:
- Kanata Light Rail Transit Planning and Environmental Assessment Study – TRANSIT PROJECT ASSESSMENT REPORT DRAFT (PDF)
- Kanata LRT – TRANSIT PROJECT ASSESSMENT REPORT DRAFT – Appendix A (PDF)
- Kanata LRT – TRANSIT PROJECT ASSESSMENT REPORT DRAFT – Appendix B (PDF)
Kanata LRT Stage 3 Map
In the map below, the proposed corridor and station locations are shown, with elevated portions of the line in green, at-grade in blue, and underground in yellow.
Map from section 8-3, page 168 of the August 2018 Report Draft from DropBox.
Stations heading west and then south:
- Moodie Station (planned for Stage 2)
- March Station
- Kanata Town Centre Station
- Terry Fox Station
- Didsbury Station
- Campeau Station (line turns south after this station)
- Palladium [stadium] Station
- Maple Grove Station
- Hazeldean Station
The diagram below from the earlier May 2018 report to City Council – Corridor Options (PDF) shows the stations a bit more clearly, although to be frank neither diagram is going to win any awards for clarity.
Barrhaven (Line 1 South)
Barrhaven is new addition to the LRT evaluations, although a rail line to Barrhaven was always envisioned as part of the Ultimate Network. The line would connect south from west Line 1 Stage 2 Baseline Station.
There is a document from Transportation Committee on October 3, 2018 (also see meeting Agenda):
- A – Barrhaven Light Rail Transit (Baseline Station to Barrhaven Town Centre) – Planning and Environmental Assessment Study – Statement of Work (PDF) – September 25, 2018
Barrhaven LRT Stage 3 Map
Above from page 5 of the Statement of Work document. Note that this is a study corridor, it’s not a proposed or final alignment.
Prince of Wales Bridge
You can see in the Ultimate Network at the top of this blog post that there is a plan for OC Transpo’s commuter rail service to cross the Prince of Wales Bridge, but I don’t know any details. I don’t even know whether they would use Line 1 or just extend Line 2 northwards. I’m happy to add details if they are provided.
These are very early days, so rely on the City of Ottawa for official word on the specific rail lines and stations for Stage 3 LRT.