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The Clodiagh River flows north through Clonaslee and Rahan in County Offaly to join the River Brosna. It holds some good stocks of trout and gets a good late run of salmon.
The best of the brown trout fishing along the Clodiagh River is from Rahan to the junction of the Tullamore River; the best of the salmon fishing is in a stretch downstream of Rahan, and the salmon usually arrive in July if there is enough water to bring them up.
Methods used here and fly and spin and open season runs from 1 March until 30 September.