Wow, that's a doozy. I'm confused by the no-cycling signs at the east/west ends of the waterfront portion. Does that mean people on foot can walk in? Obviously if the bridge is closed you can't cross the Rouge River, but I don't see why they would specifically ban bikes only from the trail.
Also, forgive my ignorance as I'm not that familiar withe Rouge National Park, but up until now there has been no trail access at all from the water, under the 401 to the rest of the park?
(I've looked at some park maps and that seems to be the case. Same with another rail corridor further up and the 407. So the park is essentially a series of disconnected segments cut off by highways and rail corridors!)
That lower access will be great to have, though I agree it doesn't look like cycling is a consideration. Always the bastard child of design in this province. In Quebec, they would 100% build in cycling from the get go.