A baulk fish pass is one of the simplest and most cost effective ways of improving fish passage over an existing weir or concrete apron. The baulk it set at an angle across the weir face and essentially captures and concentrates flow along the edge of the baulk, which can be constructed of timber or concrete. The one here is green oak and is bolted to the weir face using threaded stainless steel bar. Swinton Estates paid for the installation (repairs to the weir were already taking place) and Ure Salmon Trust paid for the timber and the design. Fish were seen using the pass literally hours after it was completed.  Only salmonids and migratory salmonids are present in this part of the River Burn so the baulk pass was a quick and cost effective solution to the problem (coarse fish are generally speaking poorer swimmers).