US Bridges

Up.Boulder RD over Bison Creek

Fair

Linn County, Iowa · 086051803 · Structure no. 000000000363750

Built
1995
30 years old
Condition
Fair
inspected September 2024
Type
Slab
Wood or Timber
Length
24 ft
1 main span
Daily traffic
29
2022 count
Owner
County
County Highway Agency

About this bridge

Up.Boulder RD over Bison Creek is a wood or timber slab carrying Up.Boulder RD over Bison Creek in Linn County, Iowa. It was built in 1995, so it is 30 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 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 29 vehicles a day, projected to reach 29 by 2044. The structure is 24 ft (7.3 m) long and 25 ft wide.

Location

Open in Google Maps
CarriesUp.Boulder RD
CrossesBison Creek
Location086051803
RouteCounty Highway 0
CountyLinn County
StateIowa
Coordinates42.26759, -91.46471
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.3 US tons
Inventory rating63.8 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29 (2022)
Projected traffic29 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 Bison Creek built?

It was built in 1995, making it 30 years old in 2025.

What condition is Up.Boulder RD over Bison 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 Bison Creek carry?

About 29 vehicles per day (2022 count).

How long is Up.Boulder RD over Bison Creek?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 25 ft wide.

Who owns Up.Boulder RD over Bison Creek?

It is owned by the County Highway Agency.