Dalnatrat Bridge carries the A828 over the Salachan Burn just south of Keil. The bridge is dated 1959, which makes it considerably later than almost every other similar bridge on the route, most of which carry the date of 1939. It is also a different design, with pedestrian refuges in the parapets over each abutment, despite having pavements either side of the full S2 carriageway. Although the main structure is constructed of concrete, as with other bridges on the A828, it is faced in stone, and the parapets are built of stone.
Prior to the opening of the bridge, traffic had to divert upstream to cross the Salachan Burn. The line of the old road is still in use, on the north bank to a forestry car park, and on the south bank as the cycle track and forest road to Bealach. Unfortunately, however, the old bridge had collapsed long ago, although it appears to have been a narrow single stone arch structure with sharp bends on either bank which could cause problems, especially for larger vehicles negotiating the bridge. In 2019, a timber pedestrian and cycle bridge was erected across the old abutments as part of the completion of this section of the NCN78 cycle route.