| Agency | Washington DOT |
| Treatment | BST Rut Fill and Chip Seal |
| Route | SR 21 |
| Location Description | Adams and Franklin Counties |
| Description of Existing Conditions | Rutting and poor ride. |
| ADT | <500 |
| Previous Pavement Treatment and Year | Chip Seal 2012 |
| Length | 24.41 Miles |
| Pre-Condition Rating | 80 out of 0-100 scale (PSC) |
| Expected Construction | 2026 |