6. Houston
The Port of Houston is vital to U.S. energy interests and is highly profitable too. In the past, Colliers has recognized Houston as North America's Most Irreplaceable Port, but this year Colliers has awarded Houston with the GDP Award, or "Gulf's Darn Profitable" Award. Houston wins for its "incredible profitability in 2013," having generated $21 million in operating revenue last July, a 7 percent increase over the same period in 2012. Houston is currently dredging for PPMX readiness, as well as upgrading cranes, and topped the list of Gulf Coast ports (the other three are New Orleans; Mobile, Ala., and Tampa, Fla.) at 2.1 million TEUs moved in 2013. Houston expended $220 million in 2013, rising to $300 million in 2014 with a new $60 million order for Super-PPMX gantry cranes. Houston's master plan is to expend $3 billion on CapEx through 2025.