and Bloxham Street, and across the street the Old Mayo Free Press Building next door to the Old Lafayette County Courthouse which can be found on the southeast corner of SR 51 and Bloxham Street. The last county road in town is CR 400. Further north it intersects CR 534, and a block later it runs into the last routed intersection in Lafayette County which is CR 354 (South Convict Spring Road), but the last intersection in the county at large is with a cul-de-sac named Northeast Castagna Lane. North of there the road crosses the historic Hal W. Adams Bridge over the Suwannee River. Suwannee County to Georgia State Line As it crosses the Suwannee County Line, the road is given the name Irvin Avenue Northwest, a name it keeps throughout much of the county. Within Luraville it remains relatively straight at first as it passes through the Peacock Springs State Recreational Area, but starts to curve northeast, where it intersects the western terminus of CR 252, the northern terminus of CR 349, and the eastern terminus of CR 250. As it enters the historic City of Live Oak the road is named Irvin Avenue Southwest, and continues to run at the same northeast to southwest angle. This trajectory end at 11th Street where CR 136 officially joins SR 51 in an overlap, however both are overshadowed by US 129(South Ohio Avenue). It is at this point both routes turn left onto Ohio Avenue. Roughly two blocks later, the road encounters CR 10A (Helvenston Street Southeast). Further downtown it becomes the location for the Old Live Oak Post Office, and later, the Suwannee County Courthouse, and then the four corners of the city at U.S. Route 90(hidden SR 10), where US 129/SR 51's name changes from South Ohio Avenue to North Ohio Avenue, and US 90's name changes from West Howard Street to East Howard Street. One block later it crosses the railroad tracks where the historic Union Depot and Atlantic Coast Line Freight Station can be found, and the Old Live Oak City Hall can be found on the next block. It is here where the multiplex with State Road 136 ends at West Duval Street Northeast. After leaving the city limits, the road eventually becomes a four-lane divided highway as it approaches Interstate 10 at Exit 283, only to revert to a two-lane undivided road after it