Louisiana State Police Maj.
Laura arrived near Cameron, La., early Thursday as a Category 4 hurricane. The casino says its Grand Palais riverboat houses 34 table games and more than 1,175 slot machines.
Gov. John Bel Edwards reported Louisiana's first fatality - a 14-year-old girl who died when a tree fell on her home in Leesville. In Louisiana, there are at least 109,811 customers with no electricity and 19,270 in Texas. The harbour police were assessing the damage, he said.
More than 500,000 coastal residents of Texas and Louisiana have been ordered to evacuate.
Laura grew almost 70% in power in just 24 hours to reach Category 3 status, and it showed no sign of weakening before making landfall late Wednesday or early Thursday.
The National Hurricane Center said a risky storm surge could still sweeping inland, but downgraded its alerts. In an average hurricane season, there are 12 named storms. Its center was moving north, about 20 miles (30 kilometers) north of Fort Polk, Louisiana.
David Roth, a National Weather Service forecaster said: "This is one of the strongest storms to impact that section of coastline".
One of the most powerful storms to hit Louisiana has made landfall in the southwest of the U.S. state.
He said: "It was enough to make us leave, but not enough for us to worry".
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But the state's buses will probably have to stop running by early afternoon because of high winds, he said.
Dealers were also awaiting a key speech by Federal Reserve chief Jerome Powell for any lead it may give on the future direction of U.S. monetary policy. Edwards mobilized the National Guard to help, and state Department of Wildlife crews had boats prepared for water rescues.
The president's campaign also said that the president "has FEMA in steady contact with state and local officials and has already mobilized resources and supplies to people in harm's way". Don't go out sightseeing.
That's according to the website PowerOutage.US, which tracks utility reports. An unusual tropical storm warning was issued as far north as Little Rock, where forecasters expected gusts of 50 miles per hour (80 kph) and a deluge of rain through Friday.
Laura made landfall near Cameron, Louisiana at about 1 a.m. CT on Wednesday as an "extremely dangerous" Category 4 storm with 150 miles per hour sustained winds.
Out on the lake, showers and thunderstorms are expected to move in after 5 p.m. Thursday and the chance of for storms should stick around until about 8 p.m. Saturday night.
NHC said Thursday morning that damaging winds and flooding rainfall are spreading inland over central and northern portions of Louisiana.
However, the NHC warned that the threat of possibly deadly storm surge would continue along the Louisiana coast as Laura moved north and then northeast.
More than 2,00,000 people in the Calcasieu and Cameron parishes of southwestern Louisiana were placed under a mandatory evacuation order.