The county road first heads northwest on Springfield Avenue but then curves to the north-northeast.

After an interchange with U.S. Route 22 (US 22), CR 577 proceeds further into Springfield Township passing houses, schools, and small businesses.

At the end of the one-way pair, the route becomes four-lane undivided Millburn Avenue and continues east through a mix of homes and businesses.

[1][2] Wyoming Avenue, which is a two-lane road, carries the route over New Jersey Transit’s Morristown Line and into wooded residential neighborhoods a short distance to the east of the South Mountain Reservation.

The road continues through Maplewood before crossing into South Orange, where it reaches CR 510.

Pleasant Avenue and crosses First Watchung Mountain as the road makes a turn to the west.

Along Prospect Avenue, CR 577 is a two-lane undivided road that turns into a four-lane divided highway as it passes through commercial areas.