State Road 13 (SR 13) is a north–south state road in the US state of Indiana. The southern terminus is at an intersection with U.S. Highway 36 (US 36) and SR 67, in the town of Fortville, and its northern terminus is at the Michigan state line. At its northern end, signage for SR 13 ends at the interchange with the Indiana Toll Road; the highway continues unsigned for an additional running concurrently with US 131 to the state line. The state road runs through six counties in central and north-central Indiana mostly through rural farm fields and small towns.

Dating back to the early days of the state road system, SR 13 was first signed in the eastern and northeastern part of the state. It was moved to its modern routing in 1931, running in two segments with the southern end in Indianapolis and the northern end at the Michigan state line. During the late 1930s, SR 13 was moved onto its modern routing in far southern Elkhart County. The southern end was moved from Indianapolis to Greenfield in the late 1930s or early 1940s. The north–south concurrency with US 33 was added in the early 1970s and the southern terminus was moved to Fortville in the mid-to-late 1970s.

Route description

SR 13 begins in Fortville at the corner of Broadway Street (US 36/SR 67) and Madison Street. The highway proceeds north on Madison Street, over CSX railroad track, before heading through the northern part of Fortville. Past Fortville the road enters Madison County and the landscape is mostly farms and fields. While in rural Madison County SR 13 has an interchange Interstate 69 (I-69) and an intersection with SR 38. The road enters Lapel and passes the Lapel Middle and Elementary Schools, before an intersection with the former northern end of SR 132. SR 13 turns towards the northwest at this intersection and passes through the center of Lapel. While in Lapel SR 13 has an at-grade crossing with a Central Indiana & Western Railroad track. Past Lapel SR 13 has an all-way stop at SR 32, before curving towards the west. Soon after the roadway becomes east–west until it curves again to become north–south. The highway passes over the White River, before merging north onto SR 37. SR 13 and SR 37 head north along the Madison-Hamilton county line, becoming the Madison-Tipton county line, before an intersection with the western end of SR 128. North of SR 128 the concurrency bends towards the northeast, before SR 13 leaves SR 37, heading due north. SR 13 enters Elwood concurrent with Anderson Street, passing mostly residential properties, before a Norfolk Southern railroad track. Past the tracks SR 13 passes through the Elwood Downtown Historic District and an intersection with SR 28. North of SR 28, SR 13 passes through the north side of Elwood, before reentering rural Madison County.

The road head north entering Grant County passing through farmland and an intersection with SR 26 and US 35/SR 22. North of US 35/SR 22 the road passes through the town of Swayzee. In the center of town SR 13 cross a Central Railroad of Indianapolis railroad track. Past Swayzee SR 13 passes through rural Grant County before entering Mier. In Mier SR 13 and SR 18 run concurrently passing over a US Rail Corporation railroad track. After the bridge SR 13 leaves the concurrency with SR 18 heading northwest, passing the Oak Hill United Schools. After the school SR 13 bends to become north–south once again, while passing through agriculture land.

SR 13 prior to 1926 was designated between SR 3, now US 40, and the Michigan state line, north of Angola. Between 1926 and 1931 the SR 13 designated went unused, but during this time frame the modern route of SR 13 between Wabash and North Manchester was part of SR 15. In 1931 SR 13 was commissioned in two segments with the first routed between Indianapolis and SR 2, now US 33, near Benton. The second segment at that time went from US 20, in Middlebury, to Michigan state line, north of Middlebury. During 1932 SR 13 was routed southeast on SR 2 and north on a newly designated roadway, passing through Millersburg, to US 20. This made SR 13 one continuous from Indianapolis to the Michigan state line. Between 1932 and 1933 SR 15 was moved west to its modern route with the small segment between SR 13 and SR 114 west of North Manchester becoming SR 213. SR 13 moved onto its modern route following US 6 and a new north–south road, now the US 33 concurrency, between 1938 and 1939. Also in this time frame the former route of SR 13 between US 6 and US 33, became part of SR 313. Between 1939 and 1941 the road between Indianapolis and the south end of the modern SR 13 and SR 37 concurrency was renumber to SR 37. During this time frame SR 13 was extended south from the south end of the modern SR 13 and 37 concurrency to Greenfield. SR 13 was rerouted on its modern route bypassing North Manchester between 1947 and 1948, replacing SR 213 and along a new roadway. The last segment of roadway to be paved was the segment of SR 13 between I-69 and SR 132 and it was completed between 1969 and 1970. US 33 was rerouted onto its modern concurrency with SR 13, between 1970 and 1971. The southern end was moved to Fortville from Greenfield between 1976 and 1977.

Major intersections

SR 13A was a north–south state road in Kosciusko and Elkhart, running east of Lake Wawasee. The highway began at an intersection with SR 8 southeast of Lake Wawase and SR 13A headed north along the eastside of Lake Wawasee. SR 13A headed towards US 6, SR 13A crossed US 6. SR 13A headed north towards US 33 (Lincoln Highway), ending at the intersection with US 33. SR 13A was formed in 1953, and it was decommissioned in 1969; the entire former route of SR 13A became county roads upon the decommission of SR 13A.

SR 313 was a short north–south state road in Elkhart County, routed between Syracuse and Benton. The entire roadway was commissioned as SR 13 in 1931. SR 313 commissioned between 1939 and 1941 when SR 13 was reroute onto its modern route. The entire former route of SR 313 became county roads upon the decommission of SR 313. Today it is a two-lane rural county road known as County Road 33.

Major intersections<br/>