Broadway Bridge on June 10, 2007
The Broadway Bridge is the largest of only three Rall-type highway bascule bridges remaining in the United States. When it opened on April 22, 1913, it was the largest bascule bridge ever built, and it remains the seventh-largest bascule bridge in the world. The 278-foot double-leaf bascule span is a Rall-type bascule, designed by Theodore Rall. Each leaf of the bascule span is nearly 140 feet long and weighs over 2,000 tons. The span takes over 20 minutes to fully open, but with 70 feet of vertical clearance, all but the largest ships will fit under it, so it only has to open about 25 times per month. When fully open, the bascule spans are 89 degrees from horizontal; nearly vertical. The rest of the bridge consists of fixed spans, four of which are Pennsylvania-Petit through truss spans. The spans on either side of the bascule span are each 295 feet long; the western approach spans are 267 and 282 feet long. The eastern approach span is a 180-foot Warren through truss span. Though originally painted black, the bridge has been painted Golden Gate Red for many years.
Broadway Bridge on June 10, 2007
| Bridge Type: | Rall-type double-leaf bascule through truss |
| Opened: | April 22, 1913 |
| Bridge designed by: | Ralph Modjeski, Chicago, IL |
| Bascule Span designed by: | Strobel Engineering Co., Chicago, IL |
| Substructure built by: | Union Bridge & Construction Co., Kansas City, MO |
| Fabricated & Erected by: | Pennsylvania Steel Co., Steelton, PA |
| Total Length: | 1,613 feet |
| Draw Span Length: | 278 feet |
| Closed Vertical Clearance: | 70 feet |
| Width: | 70 feet |
| Opening Time: | Approx. 20 minutes |
| Owned by: | Multnomah County |
| Color: | Golden Gate Red |
Historical Photos:
View of ship under Broadway Bridge (Portland Waterfront History)
Broadway Bridge fully raised (Oregon Historical Society)
View of ship under Broadway Bridge (Portland Waterfront History)
View of ship under Broadway Bridge (Portland Waterfront History)
View of ship under Broadway Bridge (Multnomah County Genweb)
View of ship under Broadway Bridge (Portland Waterfront History)
Sternwheeler under Broadway Bridge (Portland Waterfront History)
Portland & Broadway Bridge (Portland Waterfront History)
View of Union Station & Broadway Bridge(shastaroute.railfan.net/)
Broadway Bridge (Portland Waterfront History)
Continue to Fremont Bridge…
No comments:
Post a Comment