The lead engineering firm told the city of Dallas this week it needs more time to determine if two possible alternatives will finally help the Margaret McDermott pedestrian bridge open.

The hike and bike portion of the project that spans the Trinity River and holds vehicular traffic on I-30, was supposed to open in 2017, but even now there is no opening date.

The pedestrian bridge is held in place by a series of metal rods attached to the bridge at the bottom and leading up to the top of two signature arches.

The Calatrava arches, named after famed architect Santiago Calatrava, serve no functional role in the operation of the bridge constructed by TXDOT to handle traffic.

But the strength of the metal rods running vertically across both arches are key in supporting the weight of the pedestrian bridge.

Already the city has seen some of the rods begin to fatigue and crack due to wind vibrations, preventing the pedestrian bridge from opening.

In a statement to WFAA on Friday, the city of Dallas says the engineering firm Huitt-Zollars wants to meet with TXDOT and the contractor to assess if either of two proposed alternatives will work to eliminate the vibrations and fatigue.