|Bridge Name||Facility Carried / Feature Intersected||Location||Structure Type||Construction Date and Builder/Engineer|
Ohio Street Bridge
||Ohio Street (I-90 / I-94 Ramp) Over North Branch Chicago River||Chicago: Cook County, Illinois||Metal Rivet-Connected Pratt Deck Truss, Movable: Double Leaf Bascule (Fixed Trunnion) and Approach Spans: Metal Stringer (Multi-Beam), Fixed||1961 By Builder/Contractor: Unknown and Engineer/Design: City of Chicago|
|Rehabilitation Date||Main Span Length||Structure Length||Roadway Width||Main Spans||Approach Spans||NBI Number|
|1992||219.2 Feet (66.8 Meters)||367 Feet (111.9 Meters)||76 Feet (23.2 Meters)||1||2||16020226650|
This bridge is one of the few bascule bridges in Chicago that is a true deck truss. In the construction of deck truss bridges, the city more frequently preferred to raise the truss up slightly so that the top chord was above the deck functioning as a guardrail and increasing the vertical clearance under the bridge. That was not done with this bridge, so it stands out as uncommon in the city. Although the bridge was built in 1960 and is one of the younger bascule bridges in Chicago, its trusses are still composed in the traditional manner that the city used for decades including use of rivets and built-up beams with lattice. This is of interest because the trend nationally by 1960 was to switch to rolled beams, eliminate use of lattice and v-lacing, and use bolts instead of rivets. Chicago however seemed to follow its own path, perhaps not seeing a need to change when the tried and true construction methods had served them so well with so many bridges.
Adam Kerman provided the following information:
The Ohio Street bridge over the north branch of the Chicago River was built as part of the Kennedy Expressway construction in the late 1950s, most of which opened in 1960. It's part of a feeder from Wells Street, three lanes in each direction (getting rid of shoulders during a reconstruction). Note that the expressway feeder is immediately north of the original alignment of Ohio Street, which never had a bridge at this point that I know of. Erie Street, nearby, did have a bridge but it was removed years ago. I never saw it. A swath of mostly industrial buildings were demolished between Ohio and Ontario Streets to build the feeder.
Photo Credit: Patrick Hynes
Above: This historical photo shows a 1/8 scale model of a single bascule leaf similar to one of the four individual leaves of the Ohio Street Bridge. The model was created in 1942 and appears to have been part of a unique promotional effort to sell war bonds during World War II. While the model significantly predates the Ohio Street Bridge, it is not known which bridge (if any) that model was specifically built to look like, however the Ohio Street Bridge's leaves are one of the most similar structures to this model.
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