Kentucky supplemental roads and rural secondary highways are the lesser two of the four functional classes of highways constructed and maintained by the Kentucky Transportation Cabinet, the state-level agency that constructs and maintains highways in Kentucky. The agency splits its inventory of state highway mileage into four categories:[1]
The State Primary System includes Interstate Highways, Parkways, and other long-distance highways of statewide importance that connect the state's major cities, including much of the courses of Kentucky's U.S. Highways.
The State Secondary System includes highways of regional importance that connect the state's smaller urban centers, including those county seats not served by the state primary system.
The Rural Secondary System includes highways of local importance, such as farm-to-market roads and urban collectors.
Supplemental Roads are the set of highways not in the first three systems, including frontage roads, bypassed portions of other state highways, and rural roads that only serve their immediate area.
The same-numbered highway can comprise sections of road under different categories. This list contains descriptions of Supplemental Roads and highways in the Rural Secondary System numbered 500 to 599 that do not have portions within the State Primary and State Secondary systems.
Kentucky Route 500 is a 3.180-mile-long (5.118 km) rural secondary highway in western Daviess County. The highway begins at KY 56 at St. Joseph. KY 500 heads north toward Curdsville, meeting the west end of KY 456 south of the village. The highway enters the village along Main Street then passes through three right-angle turns before reaching a dead end at the confluence of Panther Creek with the Green River.[1][2][3]
Kentucky Route 505 (KY 505) is a 18.993-mile-long (30.566 km) rural secondary highway in eastern Ohio County. The highway extends from US 231 southeast of Cromwell north to KY 878 at Olaton via Oak Grove, Select, Baizetown, and Windy Hill. KY 505 begins at US 231 () southeast of Cromwell. The highway heads northeast, bridges the West Prong of Indian Camp Creek, and crosses over the William H. Natcher Parkway. The highway gradually curves east as it crosses three branches of Indian Camp Creek and passes through Oak Grove and Select. At Baizetown, KY 505 meets the northern end of KY 1118 and turns north. The highway crosses the Western Kentucky Parkway on its way to Windy Hill, where the route meets the western end of KY 2713. KY 505 crosses over the Paducah and Louisville Railway shortly before its junction with US 62 east of Rosine. The two highway run concurrently east until KY 505 splits north near Horse Branch. KY 505 continues along Dan Road, which crosses Muddy Creek and a branch of Caney Creek before reaching its northern terminus at KY 878 at Olaton.[1][5][6]
Kentucky Route 507 (KY 507) is a 23.402-mile-long (37.662 km) rural secondary highway in eastern Christian County and northern Todd County. The highway extends from KY 107 in Hopkinsville east to KY 106 and KY 178 at Claymour via Allegre. KY 507 begins at a three-way intersection with KY 107 in the city of Hopkinsville. KY 107 heads west along East Seventh Street and northeast along Greenville Road, and KY 507 heads east along East Seventh Street. Further east, KY 507 splits northeast along Butler Road while KY 1979 continues along East Seventh Street to US 68 and KY 80. KY 507 heads northeast and meets the western end of KY 508, which continues on Butler Road while KY 507 continues on Pilot Rock Road. The route twice crosses Lower Branch of the North Fork of the Little River on its way to Pleasant Hill.
KY 507 crosses the South Fork of the Little River before crossing the Christian–Todd county line. The highway continues east and meets the eastern end of KY 189 (Moss Road) just west of the route's bridge across Buck Fork Creek. KY 507 crosses the Shelton Branch of the Pond River just west of Allegre, where the route intersects KY 171 (Allegre Road). The highway continues along Highland Lick Road, which crosses the Pond River and intersects KY 181 (Greenville Road) south of Cedar Grove. KY 507 continues southeast to Claymour, the site of the route's terminus at a four-way intersection with KY 106 (Sharon Grove Road) and KY 178, which takes over the course of Highland Lick Road.[1][7][8][9][10]
Kentucky Route 508 (KY 508) is a 13.805-mile-long (22.217 km) rural secondary highway in eastern Christian County and western Todd County. The highway begins at KY 507 east of Hopkinsville. KY 507 heads west along Butler Road and northeast along Pilot Rock Road; KY 508 heads southeast along Butler Road, which veers east at its junction with KY 1716 (Overby Lane). The highway crosses the South Fork of the Little River just west of its junction with KY 1843 (Vaughns Grove Fairview Road). KY 508 passes through Honey Grove before crossing the Christian–Todd county line. The highway follows Butler Road through Britmart to Tabernacle. From there, KY 508 follows Liberty–Britmart Road to its east end at Liberty.[1][7][8][9][10]
Kentucky Route 509 (KY 509) is a 9.782-mile-long (15.743 km) rural secondary highway in northwestern Nelson County. The highway begins at KY 245 (New Shepherdsville Road) south of Samuels. KY 509 heads north along Samuels Loop to Samuels, where the route meets the eastern end of KY 3207, also part of Samuels Loop, and has a grade crossing of an R.J. Corman Railroad Group rail line where it turns east onto Samuels Road. KY 509 heads northeast along Samuels Creek to its mouth at Froman Creek and crosses the latter creek, where the route continues east to Coxs Creek. There, the highway meets the southern end of KY 2739 (Lenore Road) and intersects US 31E and US 150 (Louisville Road). KY 509 continues east as Fairfield Road, which crosses Cox Creek and reaches its eastern terminus at KY 48 (Highgrove Road) west of the city of Fairfield.[1][11][12]
Kentucky Route 513 (KY 513) is a 9.331-mile-long (15.017 km) state highway that runs from U.S. Route 62 at Fox Creek to Harry Wise Road and Gilberts Creek Road east of McBrayer via McBrayer.
Kentucky Route 518 (KY 518) was a state highway in Lincoln County. It ran from KY 78 in Hustonville via Mt. Salem Road to KY 198 in Mt. Salem. The highway was decommissioned on October 22, 2001, and the road (along with intersecting KY 1562) was given to Lincoln County.
Kentucky Route 523 (KY 523) is a 9.691-mile-long (15.596 km) state highway in Nelson County that runs from Kentucky Route 245 and Marr Lane southeast of Deatsville and going through Deatsville and Lenore. KY 523 was extended on its eastern end upon the completion of a realigned section of Louisville Road (US 31E / US 150). KY 523 now follows the former alignment of Louisville Road from its former terminus 2 miles south of High Grove northward for approximately 4½ miles to the new Louisville Road. That is south of the Salt River bridge at the border between Spencer County and Bullitt County. The new section also includes a 1½ mile concurrency with Kentucky Route 48, which was also slightly extended to meet up the newer incarnation of US 31E / US 150
Kentucky Route 533 (KY 533) is a 16.673-mile-long (26.833 km) state highway in that runs from Kentucky Route 496 southeast of Edmonton to Independence Ridge Road and Pelston Cemetery Road east of Breeding via Cofer and Breeding.
Kentucky Route 544 (KY 544) is a 3.526-mile-long (5.675 km) state highway in Metcalfe County that runs from U.S. Route 68 west of Cork to a point on Bridgeport Road immediately east of a bridge across the East Fork of the Little Barren River via Cork.
Kentucky Route 546 (KY 546) was a state highway which ran from Covington to the Ohio State Line east of Lloyd. This route was designated on May 26, 1988, and became part of Kentucky Route 9 and Kentucky Route 10 on October 13, 1994.
The original KY 546 ran from KY 106 in northeast Logan County east and northeast to KY 626 in Davis Crossroads in Butler County. This highway was given to the counties by March 18, 1982, and is now KY 2377, Hamilton-Lee Road, and Caney Fork Road.
Kentucky Route 561 (KY 561) is a 9.126-mile-long (14.687 km) state highway that runs from U.S. Route 421 northwest of Flag Fork to Kentucky River Lock and Dam No. 3 and Fallis-Gest Road at Gest via Orville.
Kentucky Route 579 (KY 579) was a state highway which ran from KY 30 (now KY 3630) in Annville southeast. The road was given to Jackson County on March 21, 1985, but was restored on June 15, 1987, as KY 3444.
KY 585 begins at KY 73 at the east city limit of Franklin; the latter highway heads west into town along Cedar Street and southeast along Rapids Road, which intersects KY 100 (Scottsville Road) just south of KY 585's terminus. KY 585 heads east along Gold City Road, which crosses over I-65 with no access and traverses Lick Creek, a tributary of the West Fork of Drakes Creek. The highway has junctions with KY 622 west of and at Gold City, the former as Hickory Flat–Gold City Road and the latter as Temperance Road. KY 585 crosses the Middle Fork of Drakes Creek at the Simpson–Allen county line. The highway continues as Old Franklin Road, which passes through Mount Aerial and crosses Hams Branch west of the route's junction with KY 1332 (Pope Road). KY 585 crosses Johns Creek and Trammel Creek on either side of Red Hill. The highway reaches its eastern terminus at KY 100 (Franklin Road) west of Scottsville.[1][13][14] The Kentucky Transportation Cabinet assigned KY 585 as a redesignation of KY 265 through a pair of September 29, 1988, official orders.[15][16]
An earlier KY 585 ran from KY 1153 northeast of Lewisburg west via Coon Range Lake Road. This highway was given to Logan County on October 25, 1982.
