---
title: "Mosquito Road Bridge – El Dorado County, California"
url: "https://www.systra.com/ibt/project/mosquito-road-bridge-el-dorado-county-california/"
type: projects
date_published: 2023-01-01
date_modified: 2026-05-15
schema:
  @type: WebPage
language: en-US
word_count: 290
reading_time: 2 min
canonical: "https://www.systra.com/ibt/project/mosquito-road-bridge-el-dorado-county-california/"
featured_image: "https://www.systra.com/ibt/wp-content/uploads/sites/21/2023/01/mosquitos-rd-bridge_4-scaled.jpg"
project-market:
  - Segmental Bridges
project-location:
  - USA
---

# Mosquito Road Bridge – El Dorado County, California

![Mosquito Road Bridge – El Dorado County, California](https://www.systra.com/ibt/wp-content/uploads/sites/21/2023/01/mosquitos-rd-bridge_4-scaled.jpg)

## DESIGN-BUILD

**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 engineering support during
construction. Engineer of Record.

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