[citation needed] Highway 28 generally follows the route followed by settlers on the Oregon Trail.

[1] The highway was extended southwest from Farson to the Fontenelle area in 1986 in response to increased soda ash shipments by truck, which required a paved road.

[2] The project was led by the Federal Highway Administration, who were granted the necessary right-of-way by the Bureau of Land Management (BLM); the agreement between the two federal agencies required that any future wildlife fence on the corridor be approved by the BLM.

[3] A 15-mile (24 km) was proposed in 1991 to redirect herds of Sublette antelopes as well as livestock who had caused vehicular accidents since the extension opened.

The BLM initially approved a plan with the Wyoming Department of Transportation (WYDOT) to fence the corridor, but WYDOT later retracted the plan following public opposition and pushback from the Wyoming Department of Game and Fish.