This bridge is a good representative example of a curved t-beam freeway overpass in Michigan. Curved t-beam overpasses exist in a few different states across the county, but most out of state examples lack the aesthetic qualities seen in Michigan's unaltered examples, where the arched beams combine with Michigan's signature Type R4 railings and the attractively shaped piers to form a visually pleasing overpass, a genuine rarity on an Interstate Highway. I-94 contains the largest number of remaining examples in Michigan, particularly unaltered examples which retain original railings. Among those with original railings, some have had Armco guardrails added to the inside, while others have no added guardrail. Those with no added guardrails on them are very rare today, and those examples stand out as the most important to recognize and document on HistoricBridges.org. The Highland Avenue Bridge is one such example with no added guardrails. It also has a deck that is original and has not been overlaid with any modern material. The bridge has a 25 degree skew, and according to the National Bridge Inventory has never been rehabilitated over its service life, yet despite this the bridge remains in very good condition. This bridge has very unusual post-tensioning rods that run under the deck between the t-beams. It is not clear why these are present on this bridge.
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