Industrial History: 1939,1988 2nd Avenue Bridge and Dams on Thunder Bay River in Alpena, MI

Bridge: (Archived Bridge Hunter; Bridge Hunter; Historic Bridges; Satellite)

Alpena (9th Street) Dam: (Satellite)

4-Mile Dam: (Satellite)

7-Mile Dam: (Satellite)

2nd Avenue Bridge

Isaac Pennock posted
Tall ship Thursday. The Pride of Baltimore II fires her cannons passing through the 2nd Avenue bridge on the Thunder Bay River in Alpena. July 2022.

Postcard with steamship RE Moody via BridgeHunter

I got a view of the railings because HistoricBridges points out that they are original even though they look like modern replacements. HistoricBridges also points out that the control tower is short and that you can see the controls through the window.

Street View, Sep 2019

Looking at a satellite image, there is no marina or commercial operation to cause the bridge to be raised. The cement plant has its own harbor on the lake. But there is some boat traffic.

Sara Townsend, Jun 2022, cropped

Alpena (9th Street) Dam

Street View, Jul 2024

EagleCreekRE
"The Ninth Street facility is the final facility on the Thunder Bay River, located in downtown Alpena about one mile from the mouth of the river in Thunder Bay on Lake Huron. It contains three horizontal Leffel Samson turbines with a total capacity of 1,200 kilowatts and produces approximately 7.2 million kilowatt-hours of clean electricity per year."

4-Mile Dam

ThnderBayPower_4mile via ThunderBayPower

EagleCreekRE
"The Four Mile facility is immediately downstream of the Norway Point facility in Alpena, Michigan. It contains three horizontal Leffel Samson turbines and one Flygt turbine for a total capacity of 2,080 kilowatts and produces approximately 9.5 million kilowatt-hours of clean electricity per year."