US Bridges

Kenyon RD SB over Dm River & B Ave

Fair

Webster County, Iowa · 1.3 Mi. N. of S. JCT.#169 · Structure no. 000000000052081

Built
1935
90 years old, rebuilt 1977
Condition
Fair
inspected August 2023
Type
Truss - Deck
Steel Continuous
Length
562 ft
3 main spans
Daily traffic
3,300
2019 count
Owner
State
State Highway Agency

About this bridge

Kenyon RD SB over Dm River & B Ave is a steel continuous truss - deck carrying Kenyon RD SB over Dm River & B Ave in Webster County, Iowa. It was built in 1935 and reconstructed in 1977, so it is 90 years old, older 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 3,300 vehicles a day, projected to reach 3,300 by 2043. The structure is 562 ft (171.3 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesKenyon RD SB
CrossesDm River & B Ave
Location1.3 Mi. N. of S. JCT.#169
RouteCity Street 0
CountyWebster County
StateIowa
Coordinates42.49531, -94.18851
Functional classUrban Other Principal Arterial

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.2 US tons
Inventory rating17.5 US tons

Structure

Structure typeTruss - Deck
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+4 approach)
Design loadH 15
Structure length562 ft (171.3 m)
Longest span136 ft (41.5 m)
Deck width43 ft (13 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,300 (2019)
Projected traffic3,300 by 2043
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Kenyon RD SB over Dm River & B Ave built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1977.

What condition is Kenyon RD SB over Dm River & B Ave 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 August 2023.

How much traffic does Kenyon RD SB over Dm River & B Ave carry?

About 3,300 vehicles per day (2019 count).

How long is Kenyon RD SB over Dm River & B Ave?

The structure is 562 ft (171.3 m) long with a longest span of 136 ft (41.5 m) and a deck 43 ft wide.

Who owns Kenyon RD SB over Dm River & B Ave?

It is owned by the State Highway Agency.