Interstate 405 at San Gabriel River Bridge Scour Mitigation Project

2 Documents in Project


SCH Number
Lead Agency
Caltrans, District 7 - Los Angeles (California Department of Transportation, District 7)
Document Title
Interstate 405 at San Gabriel River Bridge Scour Mitigation Project
Document Type
NEG - Negative Declaration
Project Applicant
Caltrans, District 7 (Los Angeles)
Present Land Use

Document Description
The California Department of Transportation (Caltrans) proposes a bridge scour maintenance project at the Interstate 405 (I-405) / Interstate 605 (I-605) interchange - a complex of three (3) bridges that traverse the San Gabriel River at the Los Angeles County/Orange County line. Two of the three bridges exist within the jurisdiction of Caltrans District 7 - Los Angeles (Bridge No. 53-1185 and Bridge No. 53-1737H from post mile 0.2/0.3), and the third bridge exists within the jurisdiction of Caltrans District 12 - Orange County (Bridge No. 53-413F at post mile 24.11). The scope of work for all three bridges includes 1) retrofit of bridge substructure foundation by constructing pier footing extensions at Pier 3 and Pier 4 at each bridge, 2) reinforcement of new footing extensions through placement of new Cast-In-Drilled-Hole (CIDH) piles, and 3) armoring of substructure retrofit through placement of rip-rap/rock protection around each pier.

Contact Information
Eduardo Aguilar, Senior Environmental Planner
Caltrans, District 7 (Los Angeles)
100 S. Main Street MS-16A
Los Angeles, CA 90012

Phone : (213) 897-8492


33°47'11.8"N 118°5'38.1"W
Long Beach Los Alamitos Seal Beach
Los Angeles Orange
Southern California
Cross Streets
Interstate 405 at San Gabriel River/Interstate 605 Interchange
Total Acres
Parcel #
State Highways
405, 605, 22
Tincher Prep, Jack L. Weaver, Francis Hopkinson
San Gabriel River

Notice of Completion

Review Period Start
Review Period End
Local Action
Use Permit Coastal Permit Local Coastal Permit
Project Issues
Aesthetic/Visual Archaeologic-Historic Biological Resources Coastal Zone Drainage/Absorption Flood Plain/Flooding Geologic/Seismic Greenhouse Gas Emissions Minerals Public Services Recreation/Parks Soil Erosion/Compaction/Grading Toxic/Hazardous Traffic/Circulation Vegetation Water Quality Water Supply Wetland/Riparian Wildlife Cumulative Effects
Reviewing Agencies
California Air Resources Board California Coastal Commission California Department of Conservation California Department of Fish and Wildlife, Marin Region 7 California Department of Fish and Wildlife, South Coast Region 5 California Department of Forestry and Fire Protection California Department of Parks and Recreation California Department of State Parks, Division of Boating and Waterways California Department of Transportation, District 7 California Department of Transportation, Division of Aeronautics California Department of Transportation, Division of Transportation Planning California Department of Water Resources California Energy Commission California Governor's Office of Emergency Services California Highway Patrol California Native American Heritage Commission California Natural Resources Agency California Public Utilities Commission California Regional Water Quality Control Board, Los Angeles Region 4 California State Lands Commission Department of Toxic Substances Control Office of Historic Preservation San Gabriel and Lower Los Angeles Rivers and Mountains Conservancy State Water Resources Control Board, Division of Water Quality


Environmental Document
21300 OPR Summary Form 04   PDF 586 K 32100 Draft IS   PDF 20389 K 32100 NOA Opportunity for Hearing Signed 03   PDF 105 K Public Notice   PDF 935 K
32100 Notice of Completion 03   PDF 253 K

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