Kettering Library has re-opened after weekend rain forced it to close on Monday when part of the roof fell in.
A notice posted on the entrances to the library in Sheep Street told users structural damage meant it would be closed until further notice.
A spokesman for Northamptonshire County Council later confirmed the library had re-opened at midday on Tuesday.
In a statement, the spokesman had added: “Following the heavy rain over the weekend, water leaked through the roof of Kettering library and part of the ceiling came down.
“We had been advised to stay closed while the ceiling and roof were fully checked out and will re-open as soon as possible.”
The spokesman also said no damage had been caused to books, other library items or the new parquet floor.
Library users had been advised to renew books online or by visiting another county library.
Major refurbishment work at the library was completed in the spring. Among the improvements were the installation of a new floor and the restoration of the original entrance.
The work received more than £250,000 in county council funding.