ATLANTIC CITY — Delays in a jetty project in the resort’s South Inlet section will keep some beaches closed when summer begins.

Work was supposed to end by Memorial Day on the $8.4 million Atlantic City North End Shore Protection project that includes doubling the length of the jetty extending from Vermont Avenue, according to state Department of Environmental Protection documents.

But rough sea conditions caused delays, meaning work will last all summer on the Vermont Avenue part of the project, DEP spokesman Larry Hajna said Wednesday.

Beach is currently closed from Vermont to Delaware avenues for work on the project.

The project entails reinforcing the existing 142 feet of jetty — or stone groin — at Vermont Avenue and adding 115 feet, plus reinforcing the 152-foot long jetty at Massachusetts Avenue and growing it to 292 feet, documents show.

The Massachusetts Avenue portion will be finished by the end of June, Hajna said.

Jetties bookend the beach fronting the new $2.4 billion Revel megaresort, an erosion-prone stretch now 350 feet wide — as much as seven times its original width — after a replenishment last fall by the Army Corps of Engineers.

A separate $18 million replenishment project covering 5.1 miles of beach and dunes in Ventnor and Atlantic City also suffered delays due to rough sea conditions, said Army Corps spokesman Steve Rochette.

Workers should finish dredging and pumping — the most disruptive project components — within the next month. All large equipment should be off the beaches by that time, too, meaning the project will make its original goal end date of June 29, Rochette said.

Dune crossovers and grass replanting could remain undone at that time, but would result in minimal disruption to beach access, Rochette said.

Officials would continue to close the beach two blocks at a time to accommodate the Army Corps replenishment project if it continues into the busiest part of the tourist season during July 4 through Labor Day, said Tom Foley, director of Atlantic City’s Office of Emergency Management.

Atlantic City Engineer Bill England did not return calls or emails seeking comment Wednesday.

Contact Emily Previti:

609-272-7221