Historical information about the Loop 12 freeway has been difficult to find. As of September 1976, TxDOT had just awarded a contract to
upgrade the last remaining non-freeway section, a two-lane road from I-30 to Jefferson, to a four-lane divided highway, but not a freeway. The freeway appears to have
been completed between 1977 and 1984, which happens to be the period when there is no index for the Dallas Morning News.
The freeway main lanes from I-30 to the railroad tracks north of route 356, which includes the Trinity River bridge, opened on April 13, 1976.
The western arc of Loop 12 was named Walton Walker Blvd in 1951, well before the route was designated as a freeway. The name Walton Walker
has been retained for the freeway.
The Trinity River bridge was built with a 52-foot clearance over the average river level
in anticipation of the construction of the Trinity waterway navigable barge canal. The construction contract for the Loop 12 bridge
was awarded in January 1973, and on March 13, 1973, voters rejected a $150 million bond issue which would have covered the local
share of the cost of the barge canal. The Trinity waterway navigation canal project was on life support after the election, and dead
by the late 1970s. So, the extra clearance and long span of the bridge turned out to be a waste of money.
More historical information about Loop 12 west will be added in the future.