| State: | OR |
| Type: | OR |
| Route: | 51 |
| Map Custom: | yes |
| Map Notes: | Route 51 highlighted in red |
| Length Mi: | 8.69 |
| Allocation: |
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| Direction A: | South |
| Terminus A: | in Monmouth |
| Direction B: | North |
| Terminus B: | near Rickreall |
| Previous Type: | OR |
| Previous Route: | 47 |
| Next Type: | OR |
| Next Route: | 52 |
Oregon Route 51 is an Oregon state highway running between Monmouth, Oregon and an intersection with Oregon Route 22 west of Salem. OR 51 traverses several highways of the Oregon state highway system: the Monmouth–Independence Highway No. 43 and the Independence Highway No. 193.[1] The route lies completely within Polk County. The Independence Highway previously continued south to US 20.
OR 51 starts, at its southern terminus, in the city of Monmouth, at an intersection with Oregon Route 99W and Oregon Route 194. It heads due east from there for approximately miles, reaching the neighboring city of Independence. In Independence, it turns north, running parallel to the Willamette River, and continues for 6miles. OR 51 terminates at an intersection with OR 22 near Brunks Corner.
While no significant improvements are planned to OR 51 itself; a proposed project to improve OR 22 includes conversion of the (notoriously dangerous) intersection between OR 51 and OR 22 into a grade-separated interchange.[2]