US Bridges

State Route 160 over Steamboat Slough

Fair

Sacramento County, California · 03-SAC-160-19.76 · Structure no. 24 0052

Built
1924
101 years old, rebuilt 1953
Condition
Fair
inspected April 2024
Type
Movable - Bascule
Steel
Length
344 ft
3 main spans
Daily traffic
1,550
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 160 over Steamboat Slough is a steel movable - bascule carrying State Route 160 over Steamboat Slough in Sacramento County, California. It was built in 1924 and reconstructed in 1953, so it is 101 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 1,550 vehicles a day, roughly 7% of them trucks, projected to reach 4,955 by 2044. The structure is 344 ft (104.9 m) long and 19 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesState Route 160
CrossesSteamboat Slough
Location03-SAC-160-19.76
RouteState Highway 160
CountySacramento County
StateCalifornia
Coordinates38.30413, -121.57436
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.5 US tons
Inventory rating17.2 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckOpen grating
Main spans3
Design loadH 10
Structure length344 ft (104.9 m)
Longest span226 ft (68.9 m)
Deck width19 ft (5.9 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic1,550 (2009)
Projected traffic4,955 by 2044
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

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 Steamboat Slough built?

It was built in 1924, making it 101 years old in 2025. It was reconstructed in 1953.

What condition is State Route 160 over Steamboat 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 Steamboat Slough carry?

About 1,550 vehicles per day (2009 count), of which roughly 7% are trucks.

How long is State Route 160 over Steamboat Slough?

The structure is 344 ft (104.9 m) long with a longest span of 226 ft (68.9 m) and a deck 19 ft wide.

Who owns State Route 160 over Steamboat Slough?

It is owned by the State Highway Agency.