Final answer:
Strong winds, storms, and ice rams that damage bridge supports are details that demonstrate the difficulty of maintaining bridges at Niagara Falls.
Step-by-step explanation:
The conditions at Niagara Falls indeed make maintaining bridges there very challenging. Details from the chapter that support this inference include reports of strong winds and storms that often damaged the bridges. Another supporting detail is that bridges would sometimes fall after ice on the river rammed their supports, showing the harsh natural factors that engineers have to consider in that area. These examples indicate the extreme environmental challenges faced when building and maintaining bridges at such locations.