Rockville sits between Virgin and Springdale on UT-9, three miles short of the Zion park gate. The town is the second-smallest incorporated place on the Zion corridor and is built almost entirely on the south bank of the Virgin River, with the highway running through the middle and the river running parallel a hundred yards south. Most of the buildings on the older streets are pioneer-era stone — sandstone two-stories with deep window-set walls — and the town has held its 19th-century footprint better than any other settlement in the county.
A Cotton Mission outpost on the canyon mouth
Rockville was settled in 1862 as part of the same Cotton Mission wave that founded Virgin, Springdale, and the now-abandoned Grafton. The townsite was chosen because the bench was high enough to escape Virgin River flooding while still close to the river bottoms for irrigation. The early settlers built with the local sandstone — quarried from the cliffs immediately north of town — and many of those homes still stand as private residences. The Rockville historic district includes a tight cluster of 1860s and 1870s stone buildings along the old town grid south of the highway.
Grafton ghost town
Two miles south of Rockville, across the Virgin River and up the Smithsonian-Bureau road, Grafton sits as one of the more famous ghost towns in the western U.S. The town was founded the same year as Rockville (1862), washed out repeatedly by the Virgin River, abandoned permanently in 1944, and preserved by the Grafton Heritage Partnership starting in the 1990s. The 1862 cemetery, the 1886 church-schoolhouse, and the Russell and Wood homes survive in restored condition. The site is on the National Register and is open to the public during daylight hours. The 1969 *Butch Cassidy and the Sundance Kid* bicycle scene — Paul Newman riding Katharine Ross around the front yard while "Raindrops Keep Fallin' on My Head" plays — was shot at the John and Ellen Wood home, and the cottonwood tree from the scene is still standing.
The bridge and the bench
The Rockville Bridge — the 1924 Pratt-truss steel span over the Virgin River that connects UT-9 to the Smithsonian-Bureau road — is itself a National Register structure and a working access point for Grafton, the Grafton Mesa trailhead, and the canyon-rim mountain biking. The bridge is regularly closed during high water and was rebuilt in the 2000s after structural deterioration. Grafton Mesa Trail climbs from the bridge to the rim above the town and drops into Grafton — a popular intermediate-to-advanced mountain biking and hiking line with one of the better Virgin River canyon views in the corridor.
What the town is structured around
UT-9 runs east–west through the bench, with the older grid south of the highway and a small commercial cluster (a market, a few lodges, the Rockville Bridge restaurant) on the highway itself. The town's permanent population is around 250; school-age children attend the Rockville-Hurricane-area elementary system and ride the bus into Hurricane. The northern cliff face — the same red-and-white sandstone that runs through Zion — wraps the town's view to the north. It is the only Washington County town where 1860s pioneer architecture, a working historic bridge, and a Hollywood Western set are all within a mile of each other on the same county road.