|From:||Port of Menteith (NN603015)|
|To:||Blair Drummond (NS720985)|
|Distance:||7.9 miles (12.7 km)|
|Met:||A81, B822, B826, A84|
|Now part of:||A873|
|Route outline (key)|
The original B825, as listed in the 1922 Road Lists ran along what is now the A873 from the A81 at Port of Monteith to Blair Drummond on the A84. However, it was very short lived, as later A87x numbers are known to have been allocated in 1925-8, suggesting that this incarnation of the B825 may not have survived 3 years before being upgraded!
Starting on the A81 to the east of Port of Menteith the road followed a winding eastward course above the valley of the Goodie Water to the right. Presently the road reached Thornhill, where it zigzagged through the centre of town, presumably along a brief multiplex with the B822.