US Bridges

State Route 160 over Three Mile Slough

Fair

Sacramento County, California · 03-SAC-160-L6.98 · Structure no. 24 0121

Built
1949
76 years old
Condition
Fair
inspected April 2024
Type
Movable - Lift
Steel
Length
749 ft
1 main span
Daily traffic
14,300
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 160 over Three Mile Slough is a steel movable - lift carrying State Route 160 over Three Mile Slough in Sacramento County, California. It was built in 1949, so it is 76 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 14,300 vehicles a day, roughly 7% of them trucks, projected to reach 22,734 by 2042. The structure is 749 ft (228.3 m) long and 35 ft wide. If it were closed, the detour would be 85.1 mi (137 km).

Location

Open in Google Maps
CarriesState Route 160
CrossesThree Mile Slough
Location03-SAC-160-L6.98
RouteState Highway 160
CountySacramento County
StateCalifornia
Coordinates38.10513, -121.70156
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.1 US tons
Inventory rating36.8 US tons

Structure

Structure typeMovable - Lift
MaterialSteel
DeckOpen grating
Main spans1 (+4 approach)
Design loadHS 20
Structure length749 ft (228.3 m)
Longest span175 ft (53.3 m)
Deck width35 ft (10.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck15 ft (4.7 m)

Traffic and service

Average daily traffic14,300 (2009)
Projected traffic22,734 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed85.1 mi (137 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was State Route 160 over Three Mile Slough built?

It was built in 1949, making it 76 years old in 2025.

What condition is State Route 160 over Three Mile Slough in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does State Route 160 over Three Mile Slough carry?

About 14,300 vehicles per day (2009 count), of which roughly 7% are trucks.

How long is State Route 160 over Three Mile Slough?

The structure is 749 ft (228.3 m) long with a longest span of 175 ft (53.3 m) and a deck 35 ft wide.

Who owns State Route 160 over Three Mile Slough?

It is owned by the State Highway Agency.