The work involved repairing cracks, strengthening the bridge arch and abutments, and fixing sections of the canal wall below the water level.
Navigation along the canal for boaters reopened in March, with work to the road surface over the top of the bridge completed last week.
The project formed part of a £45 million programme of winter maintenance works on the country's canals and rivers, which also included replacing multi-tonne lock gates at historic Seend Lock earlier this year.
Stronger and safer
Mark Evans, waterway manager at the Canal & River Trust said: “We're really pleased that the repairs to Seend Wharf Bridge are finally complete, and it's now stronger and safer for everyone using it.
"We're also very thankful for everyone's patience while the work was going on, and hope both road and canal users enjoy the improved route through Seend. Work like this is never convenient, but it was absolutely necessary, and we're glad to have got there in the end.”