Originally scheduled to begin Sept. 15, Lopez said the road work is now slated to start on Oct. 6.
The demolition is part of TxDOT's $80 million expansion of I-35 to add lanes to both the main highway and frontage roads in the region.
During the demolition, portions of I-35 between Watson Lane and Conrads Lane will be closed to overnight traffic while the roadways are anticipated to remain open during the day.
Demolition of the overpass will begin at 8 p.m. on Oct. 6 when two north and southbound inside lanes of I-35 will be closed until 5 a.m. on Oct. 7.
The full southbound portion of the highway will be closed from 8 p.m. on Oct. 7 to 5 a.m. on Oct. 8, and two outside southbound lanes will be closed from 8 p.m. on Oct. 8 to 5 a.m. on Oct. 9.
The full northbound portion of the highway will be closed from 8 p.m. on Oct. 9 to 5 a.m. on Oct. 10, and two outside northbound lanes will be closed from 8 p.m. on Oct. 10 to 5 a.m. on Oct. 11.
Work is anticipated to be complete by Oct. 11, weather permitting, Lopez said.
The expansion project will elevate I-35 and install a new underpass with a major intersection connecting area roadways, according to TxDOT.
Traffic will be rerouted to the I-35 frontage roads during the construction and will be directed to other area intersections until the new underpass is complete.