US Bridges

250th ST over Boone River

FairPosted for load

Wright County, Iowa · 091261705 · Structure no. 000000000357801

Built
1974
51 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
175 ft
3 main spans
Daily traffic
90
2022 count
Owner
County
County Highway Agency

About this bridge

250th ST over Boone River is a steel continuous stringer/multi-beam or girder carrying 250th ST over Boone River in Wright County, Iowa. It was built in 1974, so it is 51 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. Its operating status is: posted for load restriction.

It carries about 90 vehicles a day, projected to reach 90 by 2044. The structure is 175 ft (53.3 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries250th ST
CrossesBoone River
Location091261705
RouteCounty Highway 0
CountyWright County
StateIowa
Coordinates42.69013, -93.93604
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating35.7 US tons
Inventory rating21.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length175 ft (53.3 m)
Longest span68 ft (20.7 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2022)
Projected traffic90 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 250th ST over Boone River built?

It was built in 1974, making it 51 years old in 2025.

What condition is 250th ST over Boone River 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 March 2024.

How much traffic does 250th ST over Boone River carry?

About 90 vehicles per day (2022 count).

How long is 250th ST over Boone River?

The structure is 175 ft (53.3 m) long with a longest span of 68 ft (20.7 m) and a deck 26 ft wide.

Who owns 250th ST over Boone River?

It is owned by the County Highway Agency.