It runs between the A6108 Queen's Road, in the market town of Richmond, before terminating on the A6055 in Catterick, near the A1(M) Junction 52.

The A6136 begins in the market town of Richmond as "Station Road" and crosses Mercury Bridge.

[4][5] With the A1(M) upgrade from Leeming to Barton, the A6136 now meets the A6055 Local Access Road (LAR) west of the motorway and goes across a new overbridge which replaced the old Fort Bridge.

[6] The A6055 and the A6136 run together as the A6055 through Catterick Bridge and utilising the old northern A1 junction to form a new LAR on the west side of the new motorway.

[7] However, after a period of storage in the car park of Redmire Station, it was discovered that the bridge was unsuitable and it has since been broken up.