State Route 91 Improvement Project Between State Route 57 and State Route 55

6 Documents in Project


SCH Number
Lead Agency
California Department of Transportation, District 12 (DOT)
Document Title
State Route 91 Improvement Project Between State Route 57 and State Route 55
Document Type
JD - Joint Document
Present Land Use
The project area is, for the most part, heavily developed. Land uses south of the SR-91 are generally dominated by residential development (both single- and multi-family), the Santa Ana River, parkland, industrial, and commercial development. North of SR-91 land uses include residential development (both single and multi-family), industrial, commercial, medical, the Santa Ana River, and parkland.
Document Description
The California Department of Transportation (Caltrans) District 12, in cooperation with the Orange County Transportation Authority (OCTA), is proposing to improve traffic operations on State Route 91 (SR-91) from Post Mile (PM) 4.7 to PM R10.8, State Route 57 (SR-57) from PM 15.5 to PM 16.2, and on State Route 55 (SR-55) from PM 17.4 to PM R17.9 in the cities of Anaheim, Fullerton, Orange, and Placentia in Orange County, California, a distance of approximately 6 miles. The proposed improvements would include the SR-91 freeway mainline widening, primarily in the eastbound direction, and modifications to various interchanges, connectors, ramps, and intersections. Construction of the proposed project is expected to begin in 2026 and is anticipated to be completed in 2030, a duration of approximately 3.5 years. The alternatives that were considered included the Build Alternative, which was identified as the Preferred Alternative, and the No-Build Alternative. This proposed project is included in the 2019 Federal Transportation Improvement Program (FTIP) as project ID ORA150110. It is also included in the Southern California Association of Government’s (SCAG) 2016-2040 Regional Transportation Plan/ Sustainable Communities Strategy (2016 RTP/SCS) as project ID 2M0736. Caltrans, District 12, as assigned by the Federal Highway Administration (FHWA), has prepared this Initial Study with Mitigated Negative Declaration/Environmental Assessment, which examines the potential environmental impacts of the alternatives being considered for the proposed project located in Orange County, California.

Contact Information

Kathleen Dove
Agency Name
California Department of Transportation
Contact Types
Lead/Public Agency

Agency Name
California Department of Transportation, District 12
Contact Types
Project Applicant


Anaheim, Fullerton, Orange, Placentia
Cross Streets
Intersection of SR-91, SR-57, and SR-55 (6 miles)
Total Acres
Parcel #
Please see attached NOC
State Highways
SR-91, SR-57, SR-55, SR-90
Southern CA Regional Rail Auth.
Please see attached NOC.
Santa Ana River
Other Location Info
State Route (SR-) 91 Improvement Project is located between SR-57 and SR-55 from post mile (PM) 4.7 to PM R10.8 (from west of State College Boulevard to east of Lakeview Avenue), SR-57 from PM 15.5 to PM 16.2 (from just south of SR-91 to just north of SR-91), and SR-55 from PM 17.4 to PM R17.9 (from south of SR-91 to SR-91).

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 12 (DOT), California Department of Water Resources (DWR), California Energy Commission, California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Santa Ana Region 8 (RWQCB), California State Lands Commission (SLC), Department of Toxic Substances Control, Office of Historic Preservation, San Gabriel and Lower Los Angeles Rivers and Mountains Conservancy (RMC), State Water Resources Control Board, Division of Water Quality, California Department of Conservation (DOC)
State Reviewing Agency Comments
California Department of Conservation (DOC)
Development Types
Local Actions
Transportation Project
Project Issues
Aesthetics, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Solid Waste, Transportation, Tribal Cultural Resources, Vegetation, Wetland/Riparian, Wildfire, Wildlife, Community Impacts, Environmental Justice, Railroad, Energy, and Paleontology


Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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