年度,大当別川橋(㎎／l),茂辺地川鮭見橋(㎎／l),流渓川橋(㎎／l),戸切地川戸切地橋(㎎／l),大野川有川橋(㎎／l),久根別川新久根別橋(㎎／l),常盤川臨港橋(㎎／l)
2017,0.5,0.5,0.6,0.7,0.6,1.8,0.9
2018,0.5,0.5,0.5,0.6,0.9,1.2,1.4
2019,0.5,0.5,0.6,0.9,0.9,2,1.4
2020,0.5,0.6,0.6,0.6,0.7,2.1,2.1
2021,0.9,0.6,0.6,0.7,0.7,1.7,1.8
2022,0.7,0.7,0.6,0.9,0.9,2.8,1.5
2023,0.7,0.5,0.8,0.9,0.9,2.3,1.8
2024,0.5,0.5,0.5,0.6,0.6,2,2.3