CORTLAND COUNTY, N.Y. (WSYR-TV) — UPDATE (9:40 p.m.) All lanes have been cleared.
UPDATE (8:58 p.m.): The left lane has reopened. The right lane remains closed.
A jack-knifed tractor trailer has prompted the closure of I-81 south bound at Exit 9, NY-221 (Marathon), at 8:10 p.m. Expect all lanes to be closed for up to 2 hours.

Check back here for updates as they become available.