WSP Trooper Thorson is on the scene of a semi truck and trailer crash on SR 240 near milepost 4. The accident was first reported around 9 a.m. This is about 23 miles west of Richland, Trooper Thorson reported on Twitter. Initially the highway was completely closed, but now WSP is allowing traffic to slowly pass on the dirt shoulder around the trailer. The roadway is expected to be fully open in an hour or so.