---
title: Construction of the Mosquito Road Bridge has begun in California
url: "https://www.systra.com/en/news/construction-of-the-mosquito-road-bridge-has-begun-in-california/"
type: post
date_published: 2022-11-09
date_modified: 2022-11-10
schema:
  @type: Article
language: en-US
word_count: 383
reading_time: 2 min
canonical: "https://www.systra.com/en/news/construction-of-the-mosquito-road-bridge-has-begun-in-california/"
featured_image: "https://www.systra.com/wp-content/uploads/2022/11/4.jpg"
categories:
  - Non classé
---

# Construction of the Mosquito Road Bridge has begun in California

![Construction of the Mosquito Road Bridge has begun in California](https://www.systra.com/wp-content/uploads/2022/11/4.jpg)

In California, the company Shimmick Construction laid the first stone of the new
Mosquito Road Bridge, designed by SYSTRA IBT in partnership with Quincy
Engineering Inc. Together, our teams carried out the preliminary studies and
final design of this new structure which will overlook South Arm of the American
River, for our client El Dorado County.

![mosquito-bridge0](https://www.systra.com/wp-content/uploads/2022/11/mosquito-bridge0.jpg)

_The ‘Swinging Bridge’ will become a footbridge._

### A record work on the road to the gold rush

The construction of this new bridge resonates with the history of the United
States: the American River is indeed the river where the gold rush began in
1848, with the discovery of the first nuggets at Sutter’s mill.

In the midst of gold fever, California acquired its first single-lane wooden
bridge in 1867, replaced identically in 1939. This local landmark is however in
poor condition: often under maintenance, nicknamed “Swinging Bridge”, it is
known to be a dangerous traffic axis in the region, with a maximum weight limit
per vehicle of 5 tons.

![3](https://www.systra.com/wp-content/uploads/2022/11/3-1024x576.jpg)

_The future bridge seen from the bottom of the American River valley._

El Dorado County had therefore chosen SYSTRA to design a new structure, while
retaining the historic wooden bridge, which will be limited to pedestrian and
cyclist crossings. The Mosquito Road Bridge deck will culminate at 114 meters in
height, and the maximum span between its piers will be 163.4m.

The structure chosen is that of a cantilever bridge, which will be made of a
post-tensioned concrete box-girder with elements cast on site. SYSTRA IBT was
more specifically responsible for the calculations for the preliminary studies,
the final design of the superstructure and the columns, and the review of the
studies for the foundations and the abutments.

When completed, by 2025, the Mosquito Road Bridge will provide a fast and direct
connection for the surrounding communities to Sacramento and Lake Tahoe, through
the California hinterland, via the town of Placerville in the Swansboro area.

### Key features – Mosquito Road Bridge

- Length: 365m
- Maximum height of the deck: 114m
- Number of piers: 2
- Maximum span between stacks: 163.4m
- Span of end spans: 98.2m
- Maximum pier height: 61m

[DISCOVER OUR LARGE INFRASTRUCTURE OFFER](https://www.systra.com/en/markets/major-infrastructures/)

**Categories:** Non classé