State Route 81

State Route 81 (SR 81) is a 25.7-mile-long (41.4 km) state highway in northeastern Tennessee. It travels in Unicoi and Washington counties. It connects Fall Branch with Erwin.

SR 81 beings in Unicoi County at an interchange with I-26/US 23/US 19W (Exit 37) in Erwin (with the road continuing south as SR 107). It goes north from this interchange concurrent with SR 107. The two routes leave Erwin and continue north to parallel the Nolichucky River before crossing into Washington County.

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Length of Route
25.62 mi.

Begins:
I-26/US 19W/US 23/SR 36/SR 107 in Erwin​

Ends:
SR 93 in Washington County​

Counties Covered:
Unicoi, Washington​

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