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30 Mile Road Bridge Trio

30 Mile Road Bridge Trio

Primary Photographer(s): Nathan Holth

Bridge Documented: February 18, 2005

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Key Facts

Facility Carried / Feature Intersected
30 Mile Road Over North Branch Clinton River
Location
Rural: Macomb County, Michigan: United States
Construction Date and Builder / Engineer
1920 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
49 Feet (14.94 Meters)
Structure Length
54 Feet (16.46 Meters)
Roadway Width
18 Feet (5.49 Meters)
Spans
1 Main Span(s)
NBI Number
50310H00005B040

Historic Significance Rating (HSR)

Bridge Documentation

This bridge no longer exists!

Bridge Status: Two of three of these bridges had collapsed when documented in 2005. By 2011, All bridge superstructure remains had been removed!

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

Bridges In 2005

This is a section of abandoned road that can take a person back in time and reveal what a drive in the 1920s might have been like. Three historic bridges used to carry 30 Mile Road over the Clinton River and a couple small branches. Starting from the East, you would cross a small steel stringer beam bridge with lattice guardrails. You would then cross a slightly larger steel stringer beam bridge (which is listed here as the Middle Bridge), which would also have lattice guardrails, but they would be a bit taller. Finally, you would cross the Clinton River, on a pin connected Pratt pony truss. The Michigan Historic Bridge Inventory mentions all three of these bridges, and gives a date of 1920 for the construction of all three bridges. However, in reality, they were likely much older, since the pin-connected truss bridge likely dated to before 1910, and the stringer bridges may have dated to the same time.

Today, the first small beam bridge (from the East) is the only one whose deck still stands. This was a traditional plan steel stringer beam bridge, with standard lattice guardrails and a jack-arch deck. This particular design of bridge appeared to have a guardrail problem, since several of these bridges found in Michigan, including this 30 Mile Road example, have guardrails that are falling off the bridge. It appears to be the way in which the guardrails were held on the bridge via a brace attached to the outside of the bridge... when the brace rusted, the guardrails would fall off. Field stone abutments are present, however these have been completely covered in concrete.

The second, middle bridge, is also a steel stringer beam bridge with lattice guardrails, however the guardrails are taller, and mounted differently. This bridge's fate was exactly the opposite as the first bridge - the deck has collapsed, but the guardrails have survived, mounted into the abutments at each end! The collapse of this bridge appears to have involved the concrete covered field stone abutments. Along with the deck, which appeared to have broken in the middle, the stone abutments are tipping over at one end. Flood waters appear to have helped to wash the abutments free, which resulted in them tipping over.

The truss bridge, which crosses the main Clinton River, appears to have been a pin connected Pratt pony truss. It sat on concrete abutments, that may also have cobblestones behind them. Like the middle beam bridge, the deck appears to have broke in the middle. The abutments seemed intact from what was visible, but the details of what happened might have been hidden from view.

All of these bridges appear to have been collapsed for some time, yet many parts of this bridge remained in the water at this time. Eye bars, turnbuckles, members and even the top chords are still here.

Bridges in 2010 and 2011

Robert Mahu revisited the bridges in 2010 and found things similar to what they were in 2005 although the lattice railings from the small steel stringer bridge had gone missing. However, by 2011, he visited again and found that the superstructures of all the bridges had been removed. He also found the abutments of a tiny fourth "bridge" that was about 10 yards from the truss bridge. This structure would have been easy to miss and was smaller than the three other bridges.

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