US Bridges

330th ST over Bear Creek

Poor

Buchanan County, Iowa · 087103605 · Structure no. 000000000016120

Built
1951
74 years old
Condition
Poor
inspected November 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
155 ft
3 main spans
Daily traffic
648
2022 count
Owner
County
County Highway Agency

About this bridge

330th ST over Bear Creek is a steel continuous stringer/multi-beam or girder carrying 330th ST over Bear Creek in Buchanan County, Iowa. It was built in 1951, so it is 74 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.

It carries about 648 vehicles a day, roughly 30% of them trucks, projected to reach 648 by 2042. The structure is 155 ft (47.2 m) long and 32 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Carries330th ST
CrossesBear Creek
Location087103605
RouteCounty Highway 0
StateIowa
Coordinates42.31199, -91.95835
Functional classRural Major 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 protection7 GoodSome minor problems.
Last inspectionNovember 2022
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.8 US tons
Inventory rating26.8 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length155 ft (47.2 m)
Longest span59 ft (18 m)
Deck width32 ft (9.8 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic648 (2022)
Projected traffic648 by 2042
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 330th ST over Bear Creek built?

It was built in 1951, making it 74 years old in 2025.

What condition is 330th 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 330th ST over Bear Creek carry?

About 648 vehicles per day (2022 count), of which roughly 30% are trucks.

How long is 330th ST over Bear Creek?

The structure is 155 ft (47.2 m) long with a longest span of 59 ft (18 m) and a deck 32 ft wide.

Who owns 330th ST over Bear Creek?

It is owned by the County Highway Agency.