International Bridge Technologies

Mosquito Road Bridge – El Dorado County, California

Technical details
El Dorado County

In progress

Concept, detailed design and construction engineering.
El Dorado County, California
Quincy Engineering, Inc.
SYSTRA IBT’s Role: Bridge Design Consultant and Engineer of Record


Main Span: 536 ft (163.4 m) with 322 ft (98.2 m) end spans.

The Mosquito Road Bridge spanning the South Fork of the American River replaces a one-lane timber suspension bridge built in 1939.

The three-span post-tensioned concrete box girder bridge has a 536 ft (163.4 m) main span with 322 ft (98.2 m) end spans. The bridge, which is constructed using the cast-in-place balanced cantilever segmental method, varies in depth from 12 ft (3.66 m) to 30 ft (9.15 m) and is supported by two hollow main piers consisting of 5 ft (1.52 m) confined corner octagons joined by 2 ft (0.61 m) wide walls. The columns rise nearly 200 ft (61 m) above the CIDH-supported footings, and the roadway reaches heights of approximately 375 ft (114 m) above the river.

SYSTRA IBT is responsible for detailed design and construction engineering providing technical oversight, developing structural modeling, and reviewing design calculations and construction drawings. Engineer of Record.

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Renderings by: SYSTRA IBT VIZ

Renderings by: SYSTRA IBT VIZ

Renderings by: SYSTRA IBT VIZ