US Bridges

115th ST over Bear Creek

PoorPosted for load

Story County, Iowa · 085231103 · Structure no. 000000000316170

Built
1955
70 years old
Condition
Poor
inspected November 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
33 ft
1 main span
Daily traffic
120
2022 count
Owner
County
County Highway Agency

About this bridge

115th ST over Bear Creek is a steel stringer/multi-beam or girder carrying 115th ST over Bear Creek in Story County, Iowa. It was built in 1955, so it is 70 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 120 vehicles a day, projected to reach 120 by 2042. The structure is 33 ft (10.1 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries115th ST
CrossesBear Creek
Location085231103
RouteCounty Highway 0
StateIowa
Coordinates42.18816, -93.49533
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2022
Inspection intervalevery 24 months
Operating statusPosted for load 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.6 US tons
Inventory rating21.3 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span32 ft (9.8 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2022)
Projected traffic120 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 115th ST over Bear Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is 115th ST over Bear Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2022.

How much traffic does 115th ST over Bear Creek carry?

About 120 vehicles per day (2022 count).

How long is 115th ST over Bear Creek?

The structure is 33 ft (10.1 m) long with a longest span of 32 ft (9.8 m) and a deck 24 ft wide.

Who owns 115th ST over Bear Creek?

It is owned by the County Highway Agency.