US Bridges

Gilliam Road over Fern Creek

Good

Polk County, Oregon · 0015 W of State HWY 233 · Structure no. 18072 852000015

Built
1996
29 years old
Condition
Good
inspected August 2024
Type
Slab
Prestressed Concrete
Length
41 ft
1 main span
Daily traffic
104
2020 count
Owner
County
County Highway Agency

About this bridge

Gilliam Road over Fern Creek is a prestressed concrete slab carrying Gilliam Road over Fern Creek in Polk County, Oregon. It was built in 1996, so it is 29 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 104 vehicles a day, roughly 5% of them trucks, projected to reach 159 by 2040. The structure is 41 ft (12.5 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesGilliam Road
CrossesFern Creek
Location0015 W of State HWY 233
RouteCounty Highway 0
StateOregon
Coordinates44.86045, -123.35716
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.7 US tons
Inventory rating50.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length41 ft (12.5 m)
Longest span40 ft (12.2 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic104 (2020)
Projected traffic159 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Gilliam Road over Fern Creek built?

It was built in 1996, making it 29 years old in 2025.

What condition is Gilliam Road over Fern Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does Gilliam Road over Fern Creek carry?

About 104 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Gilliam Road over Fern Creek?

The structure is 41 ft (12.5 m) long with a longest span of 40 ft (12.2 m) and a deck 24 ft wide.

Who owns Gilliam Road over Fern Creek?

It is owned by the County Highway Agency.