1. Personalnostalgia and admiration for the bridges
"Great photos, many angles and views I haven’t seen myself... I loved riding through the post office and over that bridge as a kid..." – nkrisc
2. Access to bridge internals and operational schedules
"Surprised the article doesn’t mention the McCormick Bridgehouse Museum... you can see the inside of one of those bridges." – codechicago277
"You can go on bridge lift days during the fall + spring and see inside the engine room while the bridge goes up." – bs7280
3. Why bridges are raised for sailboats and winter conditions
"yes - the lake freezes." – davidjfelix
"The sailboats in particular need the bridges raised which is why they have a scheduled time to exit. Ordinary boats can be removed closer to the water or navigate the river without the bridge being raised. Those boats are also removed for the winter." – nkrisc