Highway 36 north of Castor is down to one lane of traffic for the foreseeable future following a partial washout. The highway began giving way several kilometres north of the Highway 599 intersection due to a sinkhole caused by a collapsed culvert. According to 511 Alberta, Highway 36 is reduced to one lane with alternating traffic. Speeds are also reduced through the area. Motorists are advised to take an alternate route. Highway 855 north of H…