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Originally Posted by esquire
^ Yeah, you're probably right. I compared the site with some urban and highway diamonds and the Bishop/River is definitely wide enough for at least a single-point urban interchange configuration (sort of a super-compact diamond) but length might be a bit of an issue coming off the bridge. Maybe a folded diamond might be more appropriate?
I'm sure the City probably has probably had a plan drawn up for that intersection since the 60s or 70s... it would be interesting to know what it is.
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Oh, wait...now I remember. It wasn't what I read, it was just a matter of thinking it through. If you actually look closely, there isn't enough room for a full diamond. It's misleading because the hydro reserve corridor makes it look like there's a lot more room than there is actually is. I mean, the room is there but I don't know what the law actually says about how much room you can take from said corridors. In any case, you'd have to build two spans as opposed to one and you'd have to more or less extend either the Fort Garry bridge or build the grade separation as River Rd. going under Bishop. The conclusion I came to was that the cost couldn't justify the traffic counts. It's really just not a busy intersection despite how counter intuitive that may seem. I don't think it could be done with simple earthworks. If River Road goes over or under Bishop, it's got to be a pier supported structure pretty much the whole way. In the future, if the city allows higher density development along the riverbank fronting River road, it might make sense but for the foreseeable future it just doesn't make any cost sense at all to build a grade separation. I'm obviously no engineer and can't really say, anyway, just a total armchair civil engineer's best guess. I suppose there is a solution which involves moving River Road closer to the river although then you could only get a half diamond which is what I was thinking initially. Of course, in that case, you'd probably have to raise the Fort Garry bridge or put in a lot of cash to protect River at the the River.