US Bridges

Forest ST over Miller Slough

Fair

Santa Clara County, California · Btwn Ioof & Lewis · Structure no. 37C0321

Built
1999
26 years old
Condition
Fair
inspected November 2022
Type
Slab
Concrete Continuous
Length
63 ft
2 main spans
Daily traffic
5,000
2012 count
Owner
City
City or Municipal Highway Agency

About this bridge

Forest ST over Miller Slough is a concrete continuous slab carrying Forest ST over Miller Slough in Santa Clara County, California. It was built in 1999, so it is 26 years old, younger 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 6 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 5,000 vehicles a day, roughly 4% of them trucks, projected to reach 7,281 by 2044. The structure is 63 ft (19.1 m) long and 62 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesForest ST
CrossesMiller Slough
LocationBtwn Ioof & Lewis
RouteCity Street 0
CountySanta Clara County
StateCalifornia
Coordinates37.01185, -121.56674
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length63 ft (19.1 m)
Longest span30 ft (9.1 m)
Deck width62 ft (18.9 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2012)
Projected traffic7,281 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Forest ST over Miller Slough built?

It was built in 1999, making it 26 years old in 2025.

What condition is Forest ST over Miller 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 November 2022.

How much traffic does Forest ST over Miller Slough carry?

About 5,000 vehicles per day (2012 count), of which roughly 4% are trucks.

How long is Forest ST over Miller Slough?

The structure is 63 ft (19.1 m) long with a longest span of 30 ft (9.1 m) and a deck 62 ft wide.

Who owns Forest ST over Miller Slough?

It is owned by the City or Municipal Highway Agency.