Skip to main content

Mosquito Road Bridge


The Mosquito Road Bridge is a wooden suspension span crossing the South Fork American River of El Dorado County.  The Mosquito Road Bridge incorporates elements in it's foundation which date back to 1867 making it likely the oldest highway bridge in California still is in service for it's original purpose.  The Mosquito Road Bridge can be found approximately 6.5 miles northeast of downtown Placerville.   




Author's Note; Gribblenation's 2,000th published blog

This blog serves as the 2,000th published entry on the Gribblenation blog site.  Ironically the the 2,000th blog entry closely aligns with the 20th anniversary of Gribblenation.  Adam and Doug recently discussed the history of Gribblenation on the Gribblenation 20th Anniversary Podcast:


For my own part I (Tom) have been part of Gribblenation since late 2016, it has been an honor to be part of one of the longest lived highway pages on the web.  I feel as though I speak for everyone at Gribblenation (Adam, Doug and Dan) in that we all truly enjoy what we do and I hope that is conveyed in our writings.  Hopefully our readers have enjoyed being along for the ride over the years.   I thought the Mosquito Road Bridge would be a perfect topic for our 2,000th blog given it exemplifies our mission statement at Gribblenation; "every road has a story."  




Part 1; the history of the Mosquito Road Bridge

The Mosquito Road Bridge ("Mosquito Bridge") as currently constructed carries a road deck built in 1939.  According to bridgehunter.com the Mosquito Bridge is 245.1 feet in length and carries a 8.9 foot wide road deck.   As noted in the introduction the Mosquito Bridge is a wood suspension design.  

According to El Dorado County's public website on the Mosquito Road Bridge Construction Project the County Board of Supervisors ordered construction of Mosquito Road in 1859.  Mosquito Road was intended to plot a direct road connection between Placerville northeast to the community of Mosquito.  By 1867 the "Swinging Bridge" over the South Fork American River was constructed.  According to sierranevadageotourism.org the Swinging Bridge of Mosquito Road was referred to in a 1883 book titled "El Dorado County History."  The excerpt cited by sierranevadageotourism.org reads as follows pertaining to the Swinging Bridge of Mosquito Road:

"According to the El Dorado County History of 1883 by Paolo Sioli, 'Mosquito is connected to Placerville by a good wagon-road and a suspension bridge across the South Fork of the American River, a trail is running in the direction of Kelsey, the township center... The original bridge was constructed in 1867, and according to Orval Beckett, as quoted in the booklet, Mosquito Memories, 'This original bridge had no banisters on the sides. It was a suspension cable with No.14 telephone wires strung between the supports. When you drove onto the bridge, it would 'swing and sway' much like we have seen in the movies. When one end went down the other went up. Imagine the thrill!'"

Mosquito Road between Placerville and Mosquito can be seen on the 1887 USGS Map of the Placerville Quadrangle.  The Swinging Bridge can be observed crossing the South Fork American River.   


The Swinging Bridge of Mosquito Road would remain in service well into the 20th Century and would service early automotive travel between Placerville and Mosquito.  Indeed Mosquito Road and the Swinging Bridge can be seen on the 1935 Division of Highways Map of El Dorado County.  


According to El Dorado County's page on the Mosquito Road Bridge Construction Project the Swinging Bridge road deck was replaced in 1939 and the structure retained most of the 1867 foundations.  Since 1939 reconstruction the structure has come be known as the Mosquito Road Bridge.  The Mosquito Bridge is due to be replaced given it is poorly adapted to modern traffic.  The Mosquito Bridge is cited on the Mosquito Road Bridge Construction Project page as having a sufficiency rating of 12.5 out of 100.  

A June 2017 Environmental Impact Study does not explicitly state the fate of the current Mosquito Road Bridge.  The Environmental Impact Study does note in Chapter 2 Section 9 several public concerns which seem to favor retaining the current Mosquito Bridge given it's historic status and potential pedestrian use.   

A December 10th, 2019 El Dorado County Power Point presentation provides a overview history of the Mosquito Road Bridge Construction Project.  The selection of a new Mosquito Road Bridge design is stated to have taken place during June of 2019.  


The design sketch of the new Mosquito Road Bridge along with a graphic which shows where it will be located relative to the current span are displayed.   The new Mosquito Road Bridge will shorten Mosquito Road by slightly over a mile.  










Several historic photos of the Mosquito Road Bridge are shown in the El Dorado County Power Point presentation.  




Construction of the Mosquito Road Bridge replacement has been pushed to Spring of 2022.  




Part 2; a drive over the Mosquito Road Bridge

Mosquito Road begins at Placerville diverging northward from Main Street (former US Route 50 and the South Lincoln Highway) underneath modern US Route 50.  


Mosquito Road continues northeast out of the City Limits of Placerville as a convention two-lane highway.  At Union Ridge Road the alignment of Mosquito Road makes a left hand turn towards the South Fork American River.  













Traffic on Mosquito Road is advised that the Mosquito Bridge is ahead.  The weight limit of the Mosquito Bridge is set at 5 tons along with a 8 foot width and 25 foot length advisory.  


The Mosquito Bridge is cited to be three miles ahead on Mosquito Road just beyond Union Ridge Road.  


Mosquito Road continues northeast as a two-lane road before dropping to a single lane.  













Mosquito Road winds northeast towards the South Fork American River where traffic is given a second 5 ton weight advisory a half mile from the Mosquito Bridge.  













Approaching the final descent to the Mosquito Bridge traffic on Mosquito Road is advised of a 15% downhill grade.  


Mosquito Road swings through a sharp switchback towards the Mosquito Bridge.  Northbound traffic is advised to yield to uphill traffic.  



Mosquito Road descends to the South Fork American River and Mosquito Bridge.  Northbound traffic is advised to yield to oncoming traffic.  








Mosquito Road northbound and crosses the South Fork American River via the Mosquito Bridge. 















Mosquito Road northbound climbs away from the South Fork American River and Mosquito Bridge via four steep/sharp switchbacks.  









Turning southward Mosquito Road descends the four switchbacks on the north bank of the South Fork American River to the Mosquito Bridge.  Traffic headed southbound is advised to yield to uphill traffic.  















Southbound Mosquito Road crosses the South Fork American River via the Mosquito Bridge.  








Comments

Popular posts from this blog

The Tale of Tollhouse Road, western California State Route 168 and failed Piute Pass Highway

Western California State Route 168 is entirely located in Fresno County and is linked historically to the Tollhouse Road corridor.   Tollhouse Road is one of the oldest highways in the Sierra Nevada range of Fresno County. The corridor presently begins in at Clovis Avenue in downtown Clovis and extends northeast to Huntington Lake. In 1866 the Woods Brothers established mining claims on Pine Ridge. In 1867 Fresno County would grant the brothers a toll franchise to construct a roadway to the desirable logging areas atop Pine Ridge and near Dinkey Creek. The Woods would establish a tollhouse at the start of their franchise road and lumber mill. The lumber mill attracted settlers which led to the establishment of the mountain town of Tollhouse. Fresno County would purchase the Tollhouse Road in 1878 and make it a public highway. The county would remove the tolls and incorporate the corridor into the existing county road network. Prior to the establishment of Clovis in 1...

California State Route 73

California State Route 73 is 21 mile limited access highway aligned over the Corona del Mar Freeway and San Joaquin Hills Toll Road.  California State Route 73 connects Interstate 5 near San Juan Capistrano westward to Interstate 405 in Costa Mesa.  Prior to the construction of the Corona del Mar Freeway and San Joaquin Hills Tollway California State Route 73 was a surface highway located on largely MacArthur Boulevard. Part 1; the history of California State Route 73 What became California State Route 73 ("CA 73") entered the State Highway System in 1933 as Legislative Route Number 184 ("LRN 184").  LRN 184 was given the following route definition: "LRN 60 near Corona Del Mar to Santa Ana via Main Street" LRN 184 was announced in the April 1933 California Highways & Public Works .   LRN 184 appears for the first time on the  1934 Division of Highways Map .   LRN 184 appears under State Maintenance from US Route 101/LRN 2 in Santa Ana south ...

Mormon Emigrant Trail (Emergency US Route 50 Alternate)

Mormon Emigrant Trail is an approximately 24.5-mile portion of the original routing of the Carson Pass Highway in Eldorado National Forest.  Mormon Emigrant Trail begins at California State Route 88 near Alder Hill and extends westward to Eldorado County Route J16 at Sly Park Road.   Carson Pass was a known crossing of the Sierra Nevada by the Washoe and was surveyed in an 1844 expedition led by John C. Fremont.  The Carson Pass Highway was plotted as a wagon road by the Mormon Battalion in 1848 and was once the primary crossing of the Sierra Nevada.  By the 1880s the Carson Pass Highway had several spurs with the primary traffic corridor being rerouted to Jackson.  The original routing towards Placerville would come to be known as Morman Emigrant Trail and became part of Eldorado National Forest in 1910.  Morman Emigrant Trail is part of Forest Road 10N50 and Eldorado National Forest Route 5.  Despite being a seasonally maintained roadway corrido...