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State Route 263

Click here for a key to the symbols used. An explanation of acronyms may be found at the bottom of the page.

Routing Routing

Rte 263From Route 3 near the north city limits of Yreka northeasterly to Route 96 near the confluence of the Shasta and Klamath Rivers.

Post 1964 Signage History Post 1964 Signage History

In 1965, Chapter 1401 defined Route 263 as “Route 96 near the confluence of the Shasta and Klamath Rivers northeasterly to Route 5 near Klamath River Bridge.”

In 1968, Chapter 282 swapped a portion of the route with Route 96: “Route 96 near the confluence of the Shasta and Klamath Rivers northeasterly southwesterly to Route 5 near Klamath River Bridge the north city limits of Yreka.”

In 1972, Chapter 1216 swapped the endpoints: “Route 5 near the north city limits of Yreka northeasterly to Route 96 near the confluence of the Shasta and Klamath Rivers.”

In 1976, Chapter 1354 changed "Route 5" to "Route 3"

Pre 1964 Signage History Pre 1964 Signage History

This is the original routing of Route 99 (i.e., it is now Business Route 5), and has been bypassed by the present I-5 routing. It was part of LRN 3. It was defined in 1909.

Status Status

Klamath River Bridge (02-SIS-263, PM 56.7/57.2)

Rte 263 Klamath River BridgeIn July 2016, it was reported that a historic but deteriorating 85 year old bridge crossing the Klamath River on Route 263 is proposed for demolition and replacement in the near future, according to Caltrans documents. A Caltrans historic bridge survey determined that the Klamath River Bridge meets criteria to be listed in the National Register of Historic Places. As such, Caltrans must do some form of mitigation, but it could be as little as an informational plaque. The northernmost of a set of five bridges built in the 1930s on former US 99 through the Shasta River canyon, this piece of road was at that time “the most thickly bridged section” of any state highway in California. An alternate plan to blast tunnels through the rock formations was rejected. The bridge has an unusual 600 foot radius curve built into it, negating what would be sharp right angle turns on the north side. It is of “T-beam” construction, a less common variety of girder design associated with the 1930s. The original “window railings” were replaced with solid barriers in the late 1970s. The new bridge’s design and exact location is yet to be revealed but its construction is set to take out an old residence on the north bank of the river, the former Kamp Klamath (later called Richie’s Store and Gas Station) that served early day motorists.
(Source: Siskiyou Daily News, 7/15/2016)

In January 2017, the CTC approved for future consideration of funding a project in Siskiyou County that will replace the Klamath River Bridge on Route 263 near the city of Yreka (near the intersection of Route 96, making the scope 02-SIS-96, PM 103.00/103.6, 02-SIS-263, PM 56.7/57.2). The project is programmed in the 2016 State Highway Operation and Protection Program. The total programmed amount is $22,940,000 for capital and support. Construction is estimated to begin in Fiscal Year 2018-19. The scope, as described for the preferred alternative, is consistent with the project scope programmed by the Commission in the 2016 State Highway Operation and Protection Program.

In August 2018, it was reported that the CTC approved $18.6 million for a project that will replace the Klamath River Bridge on Route 263 from north of the Shasta River Bridge to Route 96 near the city of Yreka, and Route 96 east of State Route 263 in Siskiyou County.
(Source: Action News Now, 8/20/2018)

In December 2018, the CTC approved the California Department of Transportation’s (Department) request for an additional $4,600,000 for the State Highway Operation Protection Program (SHOPP) Bridge Replacement project (PPNO 3424) on Route 263 and Route 96 in Siskiyou County, to award the construction contract. This is an increase of 30% over the construction capital amount. This project is located at the intersection of Route 263 and Route 96 near the city of Yreka, in Siskiyou County. The project will replace the existing Klamath River Bridge, which is over 85 years old and has deteriorated extensively. The new bridge will be wider than the existing bridge to accommodate wider shoulders to meet current standards. The contract award status is pending approval of this request for supplemental funds. Construction would begin in Spring of 2019, would take 350 working days, and be completed in November 2021.

The Engineer's Estimate (EE) for this project was updated in May 2018 which included consideration of the project’s remote location. In addition, the Department requested an increase to the original programmed amount, to account for both the higher bidding environment and higher construction costs throughout the region. The Department discussed the bid results and compared bid prices with the contractors, including those who opted out of the bidding process. Although 15 contractors, sub-contractors and material suppliers obtained contract plans for the project, only two contractors submitted bids for this project. The contractors stated that this project includes many difficult, specialty contract items which only a few contractors can perform. Some of the difficult items on this contract include constructing the bridge foundation in a rocky, river environment and support falsework for an arch structure over a flowing river. The difficulty to construct this bridge, the bridge’s remote location and environmental constraints due to the proximity of the Klamath River, present added challenges and higher risks to the contractor. All these challenges and risks resulted in a limited number of bidders and higher contract bids. The EE was developed appropriate for the project including the challenging location of the existing bridge. However, the EE was still undervalued as the current trends were beyond expectations. While there are only two bidders on the project, the existing bridge is in an extensively deteriorated condition, and urgently needs to be replaced to ensure the safety of the traveling public. The Department has reviewed the bid results for possible mathematical or material unbalancing in accordance with 23CFR 635.102, and 23CFR 635.114. The bids appear to be mathematically balanced and there is no evidence of material unbalancing of the low bid.
(Source: December 2018 CTC Minutes, Agenda Item 2.5e.(4))

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Statistics Statistics

Overall statistics for Route 263:

Pre-1964 Legislative Route Pre-1964 Legislative Route

In 1959, Chapter 1062 defined LRN 263 as “[LRN 119] near Paicines to [LRN 41] near Mendota”. This is the part of present-day Route 180 from Route 25 near Paicines to Route 180 near Mendota.

Acronyms and Explanations:

Back Arrow Route 262 Forward Arrow Route 264

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