| California county routes in zone R | |
| Caption: | Example of a California county route shield |
| Label1: | County |
| Field1: | County Route X (CR X) or Route X |
| Links: | CA |
| Type: | CR |
| Map: | Map of California highlighting Riverside County.svg |
| Map Notes: | All county highways in zone R lie within Riverside County |
In the California Route Marker Program, which designates county routes in California, only two highways exist in the "R" zone, which encompasses Riverside County. A third route existed until 1970.
| State: | CA |
| Type: | CR |
| County: | Riverside |
| Route: | R1 |
| Location: | Mountain Center – Banning |
| Formed: | 1966 |
| Deleted: | 1970 |
County Route R1 (CR R1) was a county route in Riverside County, California, United States. The route was converted into a state highway as SR 243 in 1970. Its southern end was at SR 74 in Mountain Center and its northern end was in Banning.[1]
| State: | CA |
| Type: | CR |
| County: | Riverside |
| Route: | R2 |
| Length Mi: | 11.26 |
| Length Ref: | [2] |
| Location: | Desert Center – Eagle Mountain |
| Alternate Name: | Kaiser Road |
| Formed: | 1964 |
County Route R2 (CR R2) is a county route in Riverside County, California, United States. The route is known as Kaiser Road. Its southern end is SR 177 near Desert Center, and its northern end is at Eagle Mountain, a modern-day ghost town. Eagle Mountain is not openly accessible; its perimeters have been fenced and gated, with a site manager appointed to handle access requests.
The road for CR R2 is named after the now defunct Kaiser Steel, which operated in Eagle Mountain. It was founded by industrialist Henry J. Kaiser, who is also best known as the founder of health maintenance organization Kaiser Permanente.
The route was defined in 1964, and has not been altered since then.
| State: | CA |
| Type: | CR |
| County: | Riverside |
| Route: | R3 |
| Length Mi: | 23.45 |
| Location: | Radec – Sage – Hemet |
| Formed: | 1966 or 1973 |
County Route R3 (CR R3) is a county route in Riverside County, California, United States. The route is known as Sage Road, Cactus Valley Road, and State Street. Its southern end is SR 79 in Radec and its northern end is SR 74 / SR 79 (Florida Avenue) in Hemet.
At its north end in Hemet, it provides a major transportation route.
Historic information conflicts as to the date the route was defined. Some information indicates the highway was created in 1966, although other sources give a commissioning date of 1973. This is a former routing of SR 79.