I think it is mostly a mind thing, you'll get some contamination from the storm dains since they go straight into the river. And there are still bone heads that dump stuff into back lanes or right into the drains, but there has been improvements in attidude in recent years.
Sewage does not go into the river till after the wier (bonneybrook treatment plant) ironicaly the main reason for the bigger fish on the lower bow. the treatment level keeps the river "cleanish" but loads it up with nutrients. For a river that flows though a major urban center not spotless but it is remarkably clean.
One question are there places further up stream that would work for white fishing and family picnic. SWMBO would prefer a more mountains in the senery.
The foot of ghost dam?
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