| Province: | MB |
| Type: | PTH |
| Route: | 3A |
| Spur Of: | 3 |
| Spur Type: | MB |
| Maint: | Manitoba Infrastructure |
| Length Km: | 11.2 |
| Established: | 1960 |
| Direction A: | West |
| Direction B: | East |
| Terminus A: | east of Mather |
| Junction: | in Clearwater |
| Terminus B: | in Crystal City |
| Previous Type: | Hwy |
| Previous Route: | 3 |
| Next Type: | Hwy |
| Next Route: | 4 |
Provincial Trunk Highway 3A (PTH 3A) is a provincial primary highway located in the Canadian province of Manitoba. It runs from PTH 3 to the same route concurrent with PTH 34. The highway continues as PR 423 from its eastern terminus.
The highway serves as a direct connection to the town of Clearwater, and also is a shortcut. The speed limit is 90 km/h (55 mph).
PTH 3A begins at an intersection with PTH 3 (Boundary Commission Trail) in a rural part of the Municipality of Louise. It heads north through the flat farmland of the prairies to cross a bridge over Cypress Creek (closed since 2016, signed detour in place via Road 71W, Road 9N, and the southernmost portion of PR 342) and pass along the eastern edge of Clearwater, where it has an intersection with PR 342 and makes a sharp curve to the east. The highway begins paralleling a former railroad line as it travels along the southern edge of Crystal City, where it comes to an end at an intersection with PTH 3 / PTH 34 (Boundary Commission Trail). The road continues east as gravel PR 423.[1]
The entire length of Manitoba Provincial Trunk Highway 3A is a paved, rural, two-lane highway, located entirely in the Municipality of Louise.
Since 2016, PTH 3A has been split into two segments, both meeting a dead end at Cypress Creek. This due to the bridge across the creek being closed by the province due to safety concerns. The bridge was a concrete version of a Bowstring arch truss, originally built between 1919 and 1920 by the Winnipeg construction firm of Alex Gall and Company. Its original cost was $13,700. In deteriorating condition, the bridge was closed to vehicular traffic in 2016 and was demolished in spring 2018. There is a signed detour in place via Road 71W and Road 9N.[2]