It crosses Boyer Creek as 76 Road and enters the hamlet of Speedsville, a small community located on top of a mountain.

The creek reaches its source at an intersection with Yaple Road; however, CR 115 continues northwestward to serve the hamlet of Caroline Center.

[2] Outside of Caroline Center, CR 115 heads northwestward through a small valley to the community of Guide Board Corners.

From Brooktondale, the route heads northwest alongside Sixmile Creek into the town of Dryden, where it ends at an intersection with NY 79.

[2] In the early 19th century, construction commenced on a highway connecting the Catskill Turnpike (modern NY 79) to the hamlet of Speedsville near the Tioga County line.

It began at Boiceville (known today as West Slaterville) and passed through the communities of Guide Board Corners and Caroline Center on its way to Speedsville.

According to the Bicentennial history of the Town of Caroline, the name refers to the Revolutionary War:[3] The first bee for cutting the road through was held near Augustine Boyer's on 4 July 1804.

Mr. Boyer explained that he had spent seven days obtaining the services of the commissioners and surveyors to lay out the road, and these days were representative of the seven years of the Revolutionary struggle, and since the day was 4 July, and the spirit of '76 was in the air, and other spirits in their bottles, he would give the name of " '76 Road" in honor of the spirit of cooperation and dedication that the people had in working together on the project, and to honor the memory of those who worked together in laying the foundations of our country in 1776.In the early 1910s, the state of New York upgraded a local highway connecting the Catskill Turnpike near the hamlet of Besemer to Brookton (now Brooktondale).

Despite attempts to rebuild the road, the winter decimated the structure of the highway and made trouble for local emergency authorities.

This road, making concessions to demolish as little private property as possible, made several 10% curves, the legal maximum.

[26] By 1994, NY 330's former routing was designated as part of CR 115, which continued south from Guide Board Corners to Speedsville via 76 Road.

Vehicular traffic weighing more than 5 short tons (4,500 kg) was detoured at Speedsville to follow West Creek Road to NY 79 while traffic weighing less than 5 tons was directed onto Buffalo Hill Road at Caroline Center.