State Route 121 (SR-121) is a state highway that is an alternative to US-40 and US-191. It serves the communities of Vernal, Lapoint, Neola, Cedarview, and Roosevelt. From Vernal to Neola, it is signed as an east–west route. Then, from Neola to State Street in Roosevelt, it is signed as a north–south route. The route is once-more signed east–west from Roosevelt to US-40/US-191.
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