US Bridges

Up-Boulder RD over Trib to Silver Creek

Fair

Linn County, Iowa · 086051301 · Structure no. 000000000222701

Built
1986
39 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
22 ft
1 main span
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

Up-Boulder RD over Trib to Silver Creek is a wood or timber stringer/multi-beam or girder carrying Up-Boulder RD over Trib to Silver Creek in Linn County, Iowa. It was built in 1986, so it is 39 years old, younger than the Iowa average of 45.5 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 20 vehicles a day, projected to reach 20 by 2044. The structure is 22 ft (6.7 m) long and 25 ft wide.

Location

Open in Google Maps
CarriesUp-Boulder RD
CrossesTrib to Silver Creek
Location086051301
RouteCounty Highway 0
CountyLinn County
StateIowa
Coordinates42.26749, -91.36937
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.3 US tons
Inventory rating31.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span22 ft (6.7 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Up-Boulder RD over Trib to Silver Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is Up-Boulder RD over Trib to Silver Creek 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 September 2024.

How much traffic does Up-Boulder RD over Trib to Silver Creek carry?

About 20 vehicles per day (2022 count).

How long is Up-Boulder RD over Trib to Silver Creek?

The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m) and a deck 25 ft wide.

Who owns Up-Boulder RD over Trib to Silver Creek?

It is owned by the County Highway Agency.