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State Route 227

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 227Route 227 is from Route 1 south of Oceano to Route 101 in San Luis Obispo.

Post 1964 Signage History Post 1964 Signage History

In 1963, Route 227 was defined as “Route 101 near Arroyo Grande to Route 101 near San Luis Obispo.”

In 1967, Chapter 1584 added the portion from Route 1 to Route 101 was added, making the definition: “Route 1 south of Oceano Route 101 near Arroyo Grande to Route 101 near San Luis Obispo.”

In 1992, Chapter 1243 clarified the routing: “Route 1 south of Oceano to Route 101 in near San Luis Obispo.”

In 2004, AB 3047, Chapter 650 (9/21/2004) permited the California Transportation Commission to relinquish to the City of Arroyo Grande the portion of Route 227 that is located within the Arroyo Grande city limits upon terms and conditions the commission finds to be in the best interests of the state, including, but not limited to, a condition that the City of Arroyo Grande maintain within its jurisdiction signs directing motorists to the continuation of Route 227. Further, the commission may relinquish to the City of San Luis Obispo the portion of Route 227 that is located within San Luis Obispo city limits of that city, upon terms and conditions the commission finds to be in the best interests of the state, including, but not limited to, a condition that the City of San Luis Obispo maintain within its jurisdiction signs directing motorists to the continuation of Route 227. In both cases, such relinquishments become effective immediately following the recording by the county recorder of the relinquishment resolution containing the commission's approval of the terms and conditions of the relinquishment, and after they are effective, the relinquished portions cease to be state highways and may not be considered for readoption.

In October 2008, right of way in the city of Arroyo Grande on Route 227 from Route 101 to 250 feet north of Huasna Road was relinquished, under terms and conditions as stated in the relinquishment agreement, dated October 15, 2008, determined to be in the best interest of the State. Authorized by Chapter 787, Statutes of 2000, which amended Section 527 of the Streets and Highways Code.

In November 2010, right of way in the city of San Luis Obispo on Route 227 (Broad Street, South Street, Higuera Street, and Madonna Road) was relinquished, from the southerly city limits to Route 101. The City, by resolution dated August 17, 2010, waived the 90-day notice requirement and agreed to accept title upon relinquishment by the State. Authorized by Chapter 650, Statutes of 2004, which amended Section 527 of the Streets and Highways Code.

In September 2012, AB 2679 (Chapter 769, 9/29/12) updated the language to reflect the relinquishment in Arroyo Grande and San Luis Obsipo:

(b) (1) Notwithstanding subdivision (a), the commission may relinquish to the City of Arroyo Grande the portion of Route 227 that is located within the city limits of that city, upon terms and conditions the commission finds to be in the best interests of the state, including, but not limited to, a condition that the City of Arroyo Grande maintain within its jurisdiction signs directing motorists to the continuation of Route 227.

(2) A relinquishment under this subdivision shall become effective immediately following the recording by the county recorder of the relinquishment resolution containing the commission’s approval of the terms and conditions of the relinquishment.

(3) On and after the effective date of the relinquishment, both of the following shall occur:

(A) The portion of Route 227 relinquished under this subdivision shall cease to be a state highway.

(B) The portion of Route 227 relinquished under this subdivision may not be considered for future adoption under Section 81.

(c) (b) (1) The Notwithstanding subdivision (a), the commission may relinquish to the City of relinquished former portions of Route 227 within the Cities of Arroyo Grande and San Luis Obispo the are not state highways and are not eligible for adoption under Section 81. For the relinquished former portion of Route 227 that is located within the city limits of that city, upon terms and conditions the commission finds to be in the best interests of the state, including, but not limited to, a condition that the City of San Luis Obispo maintain within its jurisdiction signs directing motorists to the continuation of Route 227. 227, the Cities of San Luis Obispo and Arroyo Grande shall maintain within their respective jurisdictions signs directing motorists to the continuation of Route 227 and shall ensure the continuity of traffic flow on the relinquished portion of Route 227, including any traffic signal progression.

(2) A relinquishment under this subdivision shall become effective immediately following the recording by the county recorder of the relinquishment resolution containing the commission’s approval of the terms and conditions of the relinquishment.

(3) On and after the effective date of the relinquishment, both of the following shall occur:

(A) The portion of Route 227 relinquished under this subdivision shall cease to be a state highway.

(B) The portion of Route 227 relinquished under this subdivision may not be considered for future adoption under Section 81.

(4) For the portions of Route 227 that are relinquished, the City of San Luis Obispo shall maintain within its jurisdiction signs directing motorists to the continuation of Route 227.

Pre 1964 Signage History Pre 1964 Signage History

The original portion of this route was LRN 147, defined in 1933. The 1967 addition was a new routing.

Status Status

Unconstructed from Route 1 in Oceano to Route 101 in Arroyo Grande; however, there is now a proposed routing. No local roads adequately fit the definition of a traversable highway. Caltrans told the city of Arroyo Grande in 9/1982 that there were no plans to construct this segment.

Los Rancho Road Roundabout (~ SLO R9.09)

Rte 227 Los RanchosIn March 2019, it was reported that a roundabout may be coming to the intersection of Los Ranchos Road (~ SLO R9.09) and Route 227 in San Luis Obispo. Back in 2015, SLOCOG began studying solutions to the growing traffic jam. Now, years later, a roundabout might be getting the green light. The county believes that roundabouts have been shown to increase safety and this was the cheapest solution to relieving traffic. But the $7,000,000 proposed project is throwing some locals for a loop. The soonest the roundabout could go in is 2021. Another roundabout could also be added at Buckley Road (~ SLO R9.812), at the southern edge of the SLO airport, according to the county. The next step is to hire a design consultant and do more traffic analysis. The county says it’s secured more than $1 million in federal and regional funds for the project.
(Source: KSBY, 3/19/2019)

In November 2015, it was reported that the San Luis Obispo Council of Governments is leading a study of Route 227 from Los Ranchos (~ SLO R9.09) to Tank Farm in SLO (~ SLO 11.28, but everything above SLO 10.26 has been relinquished) to roads to explore short- and long-term improvements for traffic congestion and safety in the corridor for vehicles, bicyclists and pedestrians. The analysis will be done in partnership with San Luis Obispo County, the city of San Luis Obispo and Caltrans. The analysis will examine all of the intersections on this stretch of Route 227 and will include a list of prioritized projects with costs and benefits. Widening is off the table, but other improvements such as signals will be considered. The study, which will cost about $80,000, is anticipated to be completed by March 2016. That timeline depends on whether data collection can be done around an upcoming Caltrans project to resurface part of the highway.
(Source: SLO Tribune, 11/28/2015)

In July 2019, it was reported that the SLO COG is still looking at the roundabout on Route 227. In a 2017 preliminary study of the Route 227 corridor, a San Luis Obispo Council of Governments (SLOCOG) report identified four new roundabouts as a preferred roadway traffic relief option within a few miles of SLO’s south end — Los Ranchos Road, Farmhouse Lane, Buckley Road and Crestmont Drive. However, Los Ranchos is the only option that’s funded and under consideration as of July 2019. At a March meeting on the planning that drew about 250 community members, many residents living near the Country Club and in the Rolling Hills community voiced strong objections to Route 227 roundabouts. The neighborhood sentiment of opposition was nearly unanimous. The county — working in conjunction with SLOCOG and Caltrans — will continue to explore a roundabout concept at Route 227 and Los Ranchos Road that could potentially be a viable option to improve traffic flow. Road widening and enhanced signals also are potential fixes. Current SLO city roundabouts are mostly in residential areas with relatively low traffic speeds; however, the new roundabout proposed at Route 227 and Los Ranchos Road would require slowing vehicles down as they approach the traffic circle. Curves in the roadway would be introduced to help reduce speeds. Roundabouts are designed to naturally slow vehicles down to 20 or 30 mph as they approach the roundabout. The cost to build the roundabout at that location is about $5.5 million, which is fully funded through SLOCOG. But the project would need to be approved by Caltrans. Residents believe widening a stretch of Route 227 in both directions and synchronizing traffic lights is a better and safer option. They also say more can be done to widen US 101, where an additional southbound freeway lane from SLO currently is being planned to help relieve commuter traffic to South County. The detailed traffic engineering analysis will be shared with the public for additional feedback in 2020.
(Source: SLO Tribune, 7/17/2019)

Freeway Freeway

[SHC 253.8] From Route 1 south of Oceano to Route 101 near Arroyo Grande. Added to the Freeway and Expressway system in 1959.

National Trails National Trails

De Anza Auto Route This route is part of the De Anza National Historic Trail.

Other WWW Links Other WWW Links

Statistics Statistics

Overall statistics for Route 227:

Pre-1964 Legislative Route Pre-1964 Legislative Route

In 1947 (1st Ex Sess), Chapter 11 defined LRN 227 as “a connection between [LRN 75] near Lake Temescal in Oakland and [LRN 5] near San Leandro”

In 1957, Chapter 1911 relaxed the definition to “a connection between [LRN 75] near Lake Temescal in Oakland and [LRN 5] near San Leandro”.

This route ran from Route 24 near Lake Temescal in Oakland to US 50. This is part of present-day Route 13.


Acronyms and Explanations:


Back Arrow Route 226 Forward Arrow Route 228

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Maintained by: Daniel P. Faigin <webmaster@cahighways.org>.