Tower Lodge and Glanusk Bridge (partly in Llanfihangel Cwmdu with Bwlch and Cathedine community)

Three-span flat-decked bridge with wide segmental arches and narrow voussoirs. Constructed of coursed grey rock-faced stone in large blocks. Narrow string course with parapets above built of smaller stone blocks, and with ramped copings. In the centre of each parapet is a shield with an engraved date of 1836. Large projecting cut-waters with pyramidal tops, above which are narrow pilasters. The base of the N cut-water on the W side has been refaced in concrete blocks. Oval tie plates, through and flanking pilasters. The bridge extends Southwards to the lodge, which is located up the bank. The extension contains a large circular opening with voussoirs, through which a trackway runs with a cobbled surface. There is a further pattress plate to its N.

Tudor-revival style lodge and gate-house in the form of a late-medieval fortified tower. Square 2-storey structure with embattled parapets and high battered plinth. Octagonal turret at the SE corner. Constructed of coursed grey rock-faced stone in large blocks to match bridge. At first floor level is a pair of string courses, between which is a row of shields bearing coats of arms. There is also a string course below the parapet and at the top of the plinth. The lower storey contains a through-passage with basket arches in the N and S walls. In the upper storey are flat-headed sandstone mullioned windows with hoodmoulds, containing 3 round headed lights with diamond quarries. These openings are flanked at ground and 1st floor level by tall blind slits (except to the SE). The E side of the tower has a window to each storey, similar to the N and S sides but with 2 lights, while the ground floor window has an additional transom. There is a narrow slit at plinth level. The W side is similar to the E side but the windows both have 3 lights. Below them is a planked door to a basement room. The octagonal turret rises higher than the tower and also has an embattled parapet. It has tall narrow slits to each storey except on the S and E sides where there are single round-headed windows.

Inside the gateway are arched openings to the E and W to match those to the N and S. Beyond the W arch is a small bay with no features. To the E is a similar bay with a planked and ribbed door under a segmental head which provides access to the tower (not entered). At the N end of the bay is a similar door. Flagstone floor. Tierceron ribbed vaulting above entrance gateway.