| State: | AR |
| Type: | AR |
| Route: | 308 |
| Map: | Arkansas 308.png |
| Length Round: | 2 |
| Established: | April 24, 1963[1] |
| Length Mi1: | 6.216 |
| Length Ref1: | [2] |
| Direction A1: | West |
| Direction B1: | East |
| Terminus A1: | in Marked Tree |
| Terminus B1: | at Spear Lake |
| Length Mi2: | 10.940 |
| Length Ref2: | [3] |
| Direction A2: | West |
| Direction B2: | East |
| Terminus A2: | at Whitton |
| Terminus B2: | at Frenchman's Bayou |
| Counties: | Poinsett, Mississippi |
| Previous Type: | AR |
| Previous Route: | 307 |
| Next Type: | AR |
| Next Route: | 309 |
Highway 308 (AR 308, Ark. 308, and Hwy. 308) is a designation for two east–west state highways in Northeast Arkansas. One segment runs east from AR 149 in Marked Tree to Spear Lake. A second route, of 10.94miles begins at Highway 118 at Whitton and runs east to US 61 at Frenchman's Bayou. The highway also includes a business route and spur route in Marked Tree. All four routes are maintained by the Arkansas Department of Transportation (ArDOT).
ArDOT maintains both segments of AR 308 as part of the state highway system. ArDOT estimates the traffic level for a segment of roadway was highest near the western terminus in Marked Tree, estimated at 930 vehicles per day in 2021, on average. It drops to 220 VPD north of the Marked Tree Municipal Airport. The Mississippi County segment is highest near Whitton at 120 VPD.[4] For reference, roads under 400 VPD are classified as "very low volume local road" by the American Association of State Highway and Transportation Officials (AASHTO).[5]
No segment of AR 308 is part of the National Highway System (NHS),[6] a network of roads important to the nation's economy, defense, and mobility.[7]
Highway 308 begins at Highway 149 (10th Street / Frisco Street) in Marked Tree, a small town within the Arkansas Delta, a flat and fertile agricultural region. The route passes under the BNSF Railway tracks and curves past an industrial area before turning due north. Now forming the western boundary of the Marked Tree Municipal Airport, the route serves as the western terminus of Highway 308 Spur. Continuing north, Highway 308 serves as the eastern terminus of Highway 308 Business (Elm Street), which runs into the Marked Tree Business District before exiting the city eastbound. Highway 308 runs east through an agricultural area to an intersection with Highway 135 at the unincorporated community of Spear Lake, where it terminates.[8]
A second segment of Highway 308 runs in a rural part of Northeast Arkansas. The highway begins at a junction with Highway 118 at the unincorporated community of Whitton in Mississippi County northeast of the small town of Tyronza. AR 308 runs south to the small town of Birdsong before meeting AR 77 at Dimple. The two routes run north together in a concurrency to Denwood. AR 308 turns east, running as a section line road to Interstate 55 (I-55), where it turns south similar to a frontage road along the southbound lanes before crossing over I-55 (no access) to a junction with US 61 in Frenchman's Bayou, where it terminates.[9]
The segment between Marked Tree and Highway 135 was adopted as a state highway by the Arkansas State Highway Commission on April 24, 1963. It was rerouted in Marked Tree on October 27, 1965,[10] the former segment remains as a city street named "Old 308 Highway".
The highway between Highway 118 and Birdsong was designated a state highway on April 25, 1973,[11] with an extension to Frenchman's Bayou on February 27, 1974.[12]
Mile markers reset at concurrencies.
| State: | AR |
| Route: | 308 |
| Type: | AR-Spur |
| Length Mi: | 0.127 |
| Airport Road | |
| Formed: | June 24, 1970[13] |
| Location: | Marked Tree |
Highway 308 Spur (AR 308S, Ark. 308S, Hwy. 308S, and Airport Road) is a spur route in Marked Tree.
| State: | AR |
| Route: | 308 |
| Type: | AR-Bus |
| Length Mi: | 1.311 |
| Name1: | Elm Street/Broadway |
| Formed: | March 28, 1973[14] |
| Location: | Marked Tree |
Highway 308 Business (AR 308B, Ark. 308B, and Hwy. 308B) is a business route in Marked Tree.