Given a reference text about the Queen Isabella Memorial Bridge, tell me how long it is and when it opened.

Context: Queen Isabella Memorial Bridge was developed as a concrete pier-and-beam bridge with a steel cantilever main beam span. The memorial bridge has a travel distance of 2.5 miles and sustains the continuation of Texas Park Road 100. The watercourse thoroughfare is located in southern Cameron County, Texas and is the only road connecting South Padre Island to the geography of Texas.

The Causeway opened in 1974 and replaced the previous bridge, which had also been named Queen Isabella Causeway. A central section of the original causeway was removed and renamed the Queen Isabella State Fishing Pier. The Causeway is the second-longest bridge in Texas, stretching 2.37 miles across the Laguna Madre. It is named after Queen Isabella of Castile

Answer: The Queen Isabella Memorial Bridge opened in 1974 and is 2.5 miles long.