Miner Slough Bridge
NBI Information
Location
State: California
County: Sacramento County
Feature Carried: CA-84
Feature Crossed: Miner Slough
Latitude, Longitude: 38.2914,-121.6310
Toll: On free road
Maintenance Responsibility: State Highway Agency
Structure Open, Posted, or Closed to Traffic: Posted for other load-capacity restriction (speed, number of vehicles on bridge, etc.)
History
Year Built: 1933
Historical Significance: Bridge is not eligible for the National Register of Historic Places.
Year Reconstructed: 1953
Picture Date: October 17, 2025
Geometry
Lanes on Structure: 2
Lanes under Structure: 0
Skew: 0 degrees
Number of Main Spans: 2
Main Structure Type: Movable - Swing
Main Structure Material: Steel
Number of Approach Spans: 9
Approach Structure Type: Stringer/Multi-beam or Girder
Approach Structure Material: Wood or Timber
Condition
Inspection Date: April 2022
Deck Condition: Satisfactory
Superstructure Condition: Fair
Substructure Condition: Fair
Channel Condition: Very Good
Culvert: Not Applicable
NBI Year: 2024
Bridge Information
The Miner Slough Bridge is a swing bridge which was built in 1933. The bridge uses a simple Warren through truss design and notably uses rolled beams instead of the built-up beams that were popular at that time. This gives the bridge a fairly simple appearance and is easily overlooked. However, this moveable bridge is still operational.
On August 18, 2025, Caltrans announced that California is investing $3 Billion to enhance safety, improve travel times and boost multimodal travel options. This project includes numerous projects around the state, including a full replacement of this bridge. The proposed bridge is a fixed bridge located about 100 feet west of the existing bridge. The replacement project would improve the seismic, safety, and operational characteristics of the bridge while also reducing the maintenance efforts and costs associated with the existing bridge.
The proposed structure is a precast/prestressed concrete I-girder bridge, which would provide 12-foot-wise lanes and 8-foot-wide shoulders to accommodate pedestrians and cyclists, which is a huge improvement over the existing 18-foot-wide bridge. The piers will each consist of two cast-in-steel-shell (CISS) pile shafts supporting a cast-in-place concrete cap. The abutments will be constructed on the levees and will be founded on CISS piles.
Construction is scheduled to begin October 2026, with work in the water limited from August 1 to November 31. The project is expected to take three construction seasons.
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