Would it be safe to assume that if there are sea-run cutthroat in port moody then they would also be found on the northshore beaches (i.e. cates park, etc)? Any info would be much appreciated.
Earlier posts already answered this question. Here are some additional notes.
When targeting trout and char (especially for cutthroat trout) in the Lower Mainland streams, estuaries, saltwaters, you are set up for failure if the first question is whether a particular location produces. Just about all locations that are near creeks produce cutthroat trout. The key question is, when? This question cannot be answered by others, but yourself, for a couple of reasons. One is that experienced cutthroat trout anglers have invested the time to find the answer. Two is, the time expended on chasing them is what makes the cutthroat trout fishery appealing.
Unlike salmon, anadromous cutthroat trout do not have a regular migratory pattern. Showing up to a particular spot at a particular time does not result in catches most of the time. These opportunistic feeders go where their prey are. Follow the feed, look for signs of feed, if you want to find the fish. Get to know a few spots intimately by fishing it regularly. Develop a habit of keeping a journal to record fishing results, environmental factors at the time. Eventually there just might be a pattern.