Al, our 2004 trip log:
"We stopped for lunch at a rest area near Swee****er Station [ON 287 IN WYOMING - ABOUT 15 MILES WEST OF JEFFERY CITY]. After lunch we back tracked a mile to a one lane gravel road, named Bison Basin, that looks like it goes nowhere. We drove south on it for two miles and stopped where the two - rutted Oregon Trail crossed it. MS Streets and Trips 2002, and our GPS made it very easy to find the right spot! MS Streets has lot of detail on it [Streets 2013 has less detail of that area. Still shows Bison Basin road, shows Oregon Trail just to the east and west of it but not crossing it. I'm sure it is there though], including the Oregon Trail. There is a cement marker at the crossing point. You really have to respect and admire the families who traveled this trail on foot with ox wagon and pull cart 150-165 years ago. They covered only 8-15 miles per day and we cover that distance in 10-15 minutes. As we continued on, the white snow covered Wind River Mountains continue to loom in front of us and are always getting just a little bit bigger. "
It is west of the Split Rock memorial.