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A State Trooper blocks a westbound entrance to Interstate 12 at Louisiana 1077 due to flooding Saturday, Aug. 13, 2016, in Covington.

Update, 6:20 a.m. Wednesday 

Interstate 10 westbound reopened to all traffic at La. 73 Tuesday night. The eastbound lanes reopened earlier Tuesday.

Motorists can now travel eastbound and westbound from Baton Rouge to New Orleans, Louisiana State Police said. 

At 6 a.m., I-10 eastbound and westbound remained closed from Interstate 49 (Lafayette) to U.S. 165 (near Lake Charles) due to flooding.

Update, 2:55 p.m.

Interstate 10 West is now open from Highland Road to Siegen Lane, DOTD reported. It remains closed from LA 73 (Prairieville) to Highland Road.

Update, 2:15 p.m.

Interstate 10 eastbound has reopened from Siegen Lane to La. 73 (Prairieville). I-10 westbound remains closed. 

At 2:15 p.m., the right lane on I-10 East past Highland was blocked due to flooding. 

Update, 6:30 a.m. Tuesday

Interstate 12 reopened overnight in both directions, according to the state Department of Transportation. 

The eastbound lanes reopened around 8 p.m. Monday, and the westbound lanes from Hammond to Baton Rouge reopened shortly after midnight Tuesday. 

On Tuesday morning, Interstate 10 remained closed in both directions from Siegen Lane to Prairieville. Traffic is being diverted at La. 73 to U.S. 61 northbound.

I-10 eastbound and westbound also remained closed between Interstate 49 (Lafayette) and U.S. 165 (near Lake Charles) due to flooding.

See a list of current road closures in Baton Rouge here

Updated, 10:30 p.m. Monday:

DOTD reported Monday night that that I-12 eastbound is open from I-10 in Baton Rouge to I-10 in Slidell, and I-12 westbound is open from O'Neal Lane to the I-10/I-12 split in Baton Rouge. 

Original story:

Parts of flood-soaked Interstate 12 were reopened to traffic Monday, but when travelers can use the interstate in both directions is unclear.

At Juban Road, eastbound traffic resumed early in the afternoon, one day after about 1,000 motorists were stranded because floodwaters made sections impassable between Baton Rouge and Hammond.

On Monday night, state officials announced that I-12 eastbound was reopened at Airline Highway. In addition, westbound traffic on I-12 at O'Neal Lane was back in business.

Two steps are required before I-12 is completely reopened, said Trooper First Class Bryan Lee, a spokesman for State Police.

First the water has to recede, he said, and then inspections have to be done on the interstate and bridges.

Lee declined to speculate on how long that will take.

Rodney Mallett, a spokesman for the state Department of Transportation, said in an email Monday that any bridge overtopped with water has to be inspected by DOTD officials before it is reopened.

Mallett said inspectors will be looking for scouring, cracking and shifting.

Lee said most vehicles have been moved off the site of the massive backup on Saturday and Sunday.

For the most part, Lee said, cars and trucks still on the shoulder of I-12 are not driveable.

Most of the activity at I-12 East at Airline was trucks hauling boats.

The closing of I-12 East has also caused traffic backups at the Airline South exit, where traffic is being diverted.

Many cars and trucks were turning around on Airline, headed for U.S. 190 East.

In addition, the nearby Celtic Studios is housing about 2,000 evacuees, with blue cots filling most of the space.

The two-day plus I-12 backup sparked criticism from motorists on why it took so long for assistance.

But rescue efforts on Saturday and Sunday were hampered by road conditions and weather problems, a spokesman for the St. Tammany Parish Sheriff's Office said Monday.

That department was assisting drivers stalled west  of St. Tammany, not in the parish.

The stretch of I-12 where vehicles were stalled for days — mostly between Hammond and Baton Rouge — was marked by sections of high water and dry roadway, which authorities called islands.

"Some areas were too high to get through with a high water vehicle," said Capt. Daniel Seuzeneau, a spokesman for the St. Tammany Parish Sheriff's department.

"You get a boat and you go through and then you hit dry land. What  do you do with the boat?" he asked.

Poor weather, especially early Sunday, made it hard to use helicopters, Seuzeneau said.

"It was a bad situation," he said. "It was kind of tough to get through."

The massive backup on I-12 stemmed from flood waters spawned by record rain that has forced hundreds of homeowners into shelters in Baton Rouge, including The River Center, and nearby parishes.

About 1,000 stranded interstate motorists, many stuck in cars and trucks for 24 hours and more, were rescued late Sunday, state officials said.

They described miserable conditions, including heat, a lack of bathrooms and little information on their plight.

Seuzeneau said his office brought about 50 people to St. Tammany Parish, with 40 remaining in shelters and 10 others picked up by relatives.

State Police and others hauled in water and food for marooned motorists.

However, some complained that distribution efforts were non-existent and that the arrival of food and water set off wild scrambles.

Follow Will Sentell on Twitter, @WillSentell.