This northern segment became LA 89-1 in 2013 when a portion of the route in Youngsville was transferred to the city following a highway improvement project, which created a gap in state maintenance.

In the future, the entire corridor is proposed to be turned over to local control as part of the Louisiana Department of Transportation and Development (La DOTD) road transfer program.

LA 89 heads north, running parallel to the Iberia Parish line as it bends around the western shore of Lake Peigneur.

[1] As of 2018, the portion of LA 89-1 from the roundabout to Heart D Farm Road is under agreement to be removed from the state highway system and transferred to local control.

[23] La DOTD is currently engaged in a program that aims to transfer about 5,000 miles (8,000 km) of state-owned roadways to local governments over the next several years.

[24] Under this plan of "right-sizing" the state highway system, the entire route of LA 89 is proposed for deletion as it does not meet a significant interurban travel function.

[25][26] Louisiana Highway 89-1 (LA 89-1) runs 5.05 miles (8.13 km) in a north–south direction from the junction of Lafayette and Iberia Streets in Youngsville to US 90 on the Lafayette–Broussard line.

It was part of LA 89 until a portion of the route in Youngsville was returned to local control in 2013, creating a gap in state maintenance.

From the south, LA 89-1 begins at a roundabout junction with Iberia Street in the city of Youngsville, connecting with US 90 to the east and the communities of Milton and Maurice to the west.

It heads north on Lafayette Street and passes through a mixture of rural farmland and suburban residential development.

A junction with LA 3073 (Ambassador Caffery Parkway), a four-lane highway, connects with the city of Scott west of Lafayette.

In the future, both routes are planned to be decommissioned altogether as part of La DOTD's road transfer program.