Posts North Side of DeBoville Slough Closed by City of Coquitlam July 1, 2020 July 1, 2020 July 1st and its raining, the City of Coquitlam has closed the north side of DeBoville Slough due to high water concerns so I went out and had a look. Sunny morning for nest box cleaning FODBS Meets on Thursday, July 30th, outdoors.