This bridge is a remnant of this road's trunk line past. This road used to be M-28, but is today a very rural local road since M-28 was realigned to a new location. Perhaps a result of its rural location and light traffic thanks to the realignment, this bridge remains today in good condition. One of the nice aspects of this bridge, thanks again to its rural road and local usage, is that it does not have modern approach Armco style guardrails. In fact, it has no approach guardrail of any kind. Only hazard signs are present at the end posts. It is a nice chance to see this bridge design without unsightly modern guardrails bolted into the sides of the girder end posts.
Information and Findings From Michigan Historic Bridge Inventory
Crossing the Rock River in rural Covington Township, this medium-span concrete bridge carries Old M-28 about two miles east of the town of Covington. The structure is comprised of a single, 60-foot concrete
through girder span, with arched ribs that rest on angled concrete brackets cantilevered from the concrete abutments. A series of concrete floor beams span between the two girders; these are cast integrally with the 22-foot-wide
concrete deck. The arched girders feature typical MSHD detailing, with corbeled bulkheads and six panels recessed in the concrete spandrel walls. The Rock River Bridge is today in excellent condition, without alteration.
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