No one was hurt in the blaze, but it is feared to have cause considerable damage to the Lazienkowski Bridge, a 40-year-old steel span that was set to undergo renovation.
"The main operation lasted 12 hours," fire service spokesman Pawel Fratczak told AFP today. "But the firefighters are continuing to monitor the site."
"Experts were going to examine the state of the bridge (Sunday) morning to check for any structural damage... But it is already clear that the asphalt on a long stretch will have to be relaid," Fratczak said.
The effort involved 144 firefighters deployed on both banks of the river as well as on a barge that sprayed jets of water onto the burning structure.
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A huge cloud of smoke hung over the Saska Kepa neighbourhood near the banks of the Vistula on Sunday morning.
The fire broke out at 1630 GMT Saturday when wooden planks stored under the six-lane bridge burst into flames, quickly spreading to wooden parts of the bridge.
The Lazienkowski bridge was ravaged by a fire the year after it was built in 1974.