They could always just tear up the Navigation ROW and put in the extension of the La Porte freeway. : Waits for rotten vegetables and other foodstuff projectiles to be angrily hurled: No, just kidding. From a cursory glance at the satellite imagery from google maps it seems to make more sense from a ROW acquisition perspective to use Navigation because most of the work would occur within the land already maintained by the city or txdot. Canal is too narrow, and so is Harrisburg. Even if you were to acquire land for improving Harrisburg the cost may be a much larger portion of the budget than desirable. Of course, they may have to acquire land anyway, so it might not be that big of a deal.