I-5 Grade Raise
| Project ID | EA | District | County | Route | Funding Program |
| 0323000171 | 03-4J470 | 03 | SAC | 5 | SHOPP |
Project Description:
Near Elk Grove, from Mokelumne River Bridge to Lambert Road Undercrossing. Raise roadway profile, rehabilitate pavement and drainage systems, construct concrete barrier and maintenance vehicle pullouts, and upgrade signs, facilities to Americans with Disabilities Act (ADA) standards, and Transportation Management System (TMS) elements.
Purpose:
The purpose of this project is to mitigate flooding for a 10-year storm event and improve the resilience of the transportation system to withstand existing and projected climate impacts.
The project aims to preserve and sustain the I-5 corridor and its structures, while enhancing safety, reliability, rideability, and existing drainage systems. It also includes improvements to highway signs, traffic management systems, and safety elements within the project limits.
Sustainability
The I-5 corridor experiences flooding during major storm events which was highlighted by recent storms which occurred between December 31, 2022 and January 21, 2023. According to the Caltrans District 3 Climate Change Vulnerability Assessment Map, there is a forecast 2.4% rise in the 100-year precipitation depth for 2055 in the project corridor. I-5 within the project limits is also listed as a SLR risk in the same assessment map. North of the slough structures the mainline profile elevation falls below the 12’ to 13’ water surface elevation level of a 10-year storm event, as determined by the Federal Emergency Management Agency (FEMA), as shown on their current Flood Insurance Risk Maps (FIRM). Over time, the existing roadway could be eroded and inundated, resulting in the loss of a safe, reliable transportation corridor.
Safety
Current inside shoulder along the I-5 corridor is below minimum standard. Bridge approach railing and guardrail are not to current MASH standards.
Drainage
Drainage assessment indicates that multiple culvert systems within the project limits are in fair to poor condition. Drainage system expansion is required to sufficiently capture stormwater runoff along the corridor.
Pavement
Existing pavement within the project limits exhibits signs of distress. Based on the pavement assessment, in flexible pavement sections, Alligator B Cracking will rise from the 2019 Automated Pavement Condition Survey (APCS) measurement of 0.03 % to 7.00% within the project limits by Ready To List (RTL) year 2030/2031. The third stage cracking for the rigid pavement sections will increase from 0.40% in 2019 to 2.61% by RTL year 2030/2031. If pavement conditions are not addressed, the existing pavement is expected to further deteriorate which would result in higher maintenance costs.
Transportation Management System (TMS)
Transportation data collection is inadequate within the project limits.
Other
Post-mounted signs that are non-standard have been identified within the project limits. One overhead signal ahead flashing beacon is at the end of its life cycle.
Funding:
This project is programmed in the 2024 SHOPP and has been funded with the 20.XX.201.999 Sustainability/Climate Change Program as a long lead project.
Cost Estimate:
| Support Cost | $21,820,000 |
| Capital Cost | $111,590,000 |
| Total Project Cost | $133,410,000 |
Schedule:
| Project Approval & Environmental Document | May 2025 |
| Design Completed | October 2030 |
| Advertise Project | November 2030 |
| Begin Construction | February 2031 |
| Complete Construction | February 2032 |
Project Contacts:
John Bamfield, Project Manager, (530) 720-9938; John.Bamfield@dot.ca.gov
Dennis Keaton, Public Information Officer, (916) 825-5252; Dennis.Keaton@dot.ca.gov