[2] The southern terminus of LA 1 (29°15′37″N 89°57′49″W / 29.2603°N 89.9637°W / 29.2603; -89.9637) is at a dead end in Grand Isle on the south bank of Bayou Rigaud.

It heads southwest and west through Grand Isle, turning northwest where it meets LA 3090 (the road to Port Fourchon).

At Leeville the road crosses Bayou Lafourche on the Leeville Bridge and begins to parallel the bayou on its west bank, heading through towns such as Golden Meadow, Larose, Lockport, Raceland, Thibodaux, Napoleonville and Paincourtville.

[3] LA 1 heads inland through such towns as Simmesport, Moreauville, and Marksville to Alexandria, where it meets the Pineville Expressway (U.S. Highway 165/LA 28).

[3] From Alexandria to Shreveport, LA 1 generally parallels Interstate 49, including a bypass around Natchitoches.

Also, a two-mile section between Norco and Montz was eliminated in 1935 when the parallel Airline Highway bridge across the Bonnet Carré Spillway was opened.

North of Cheneyville, it used US 71 and parts of some bypassed roads to Chambers, then Old Baton Rouge Highway to Alexandria.

These improvements are in order to facilitate evacuations of Port Fourchon and Grand Isle in the event of a hurricane, as LA 1 in this area is vulnerable to flooding, regardless of strength of storm.

[6] The GeauxPass is also compatible with the Crescent City Connection and all future Louisiana toll roads and the Lake Pontchartrain Causeway, but not the ferries.

Vehicle drivers must now pay before accessing the expressway and the pre-pay kiosks have been removed from their respective sites.

Funding for the project through taxes and grants was not available, leading to the requirement to pay for the construction via collecting tolls.

By law, LA 1 toll revenues may only be utilized to repay construction loan debts for the expressway.

Construction on the section between Leeville and Golden Meadow began in late 2021 with a completion date to be determined.