US Bridges

Uppr Boulder RD over Boulder Creek

Fair

Linn County, Iowa · 086051601 · Structure no. 000000000222731

Built
1992
33 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
38 ft
2 main spans
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

Uppr Boulder RD over Boulder Creek is a wood or timber stringer/multi-beam or girder carrying Uppr Boulder RD over Boulder Creek in Linn County, Iowa. It was built in 1992, so it is 33 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 20 vehicles a day, projected to reach 20 by 2044. The structure is 38 ft (11.6 m) long and 24 ft wide.

Location

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CarriesUppr Boulder RD
CrossesBoulder Creek
Location086051601
RouteCounty Highway 0
CountyLinn County
StateIowa
Coordinates42.26758, -91.43937
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 protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.1 US tons
Inventory rating50.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span18 ft (5.5 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 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 Uppr Boulder RD over Boulder Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is Uppr Boulder RD over Boulder 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 Uppr Boulder RD over Boulder Creek carry?

About 20 vehicles per day (2022 count).

How long is Uppr Boulder RD over Boulder Creek?

The structure is 38 ft (11.6 m) long with a longest span of 18 ft (5.5 m) and a deck 24 ft wide.

Who owns Uppr Boulder RD over Boulder Creek?

It is owned by the County Highway Agency.