Bresle

The Bresle is a coastal river in Normandy, rising in the Seine-Maritime department and flowing into the Manche at the town of Le Tréport.

The activities relating to the monitoring of migratory fish at the site are the subject of annual reports:

Reports: 2023 - 2022 - 2021 - 2020 - 2019 - 2018 - 2017 - 2016 - 2015 - 2014 - 2013 - 2012 - 2011 - 2010 - 2009 - 2008 - 2007 - 2006

The main course of the Bresle, 72 km long, drains a catchment area of approximately 748 km². The river rises in the commune of Criquiers (76) during periods of low groundwater levels.

When groundwater levels are higher, the river may resurface some 1,100 metres further upstream in the Oise, in the commune of Blargies.

The flow regime of the Bresle is profoundly influenced by the chalk aquifer, which acts as one of its drains. Through its regulating role, the aquifer gives the river a regular flow regime with sustained low water levels and mild floods.