US Bridges

D54 Danbury over Creek

Poor

Woodbury County, Iowa · 086432301 · Structure no. 000000000350570

Built
1959
66 years old
Condition
Poor
inspected June 2023
Type
Culvert
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
319
2022 count
Owner
County
County Highway Agency

About this bridge

D54 Danbury over Creek is a concrete continuous culvert carrying D54 Danbury over Creek in Woodbury County, Iowa. It was built in 1959, so it is 66 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 319 vehicles a day, roughly 23% of them trucks, projected to reach 319 by 2043. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesD54 Danbury
CrossesCreek
Location086432301
RouteCounty Highway 0
CountyWoodbury County
StateIowa
Coordinates42.25499, -95.8173
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length27 ft (8.2 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic319 (2022)
Projected traffic319 by 2043
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$446,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was D54 Danbury over Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is D54 Danbury over 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 June 2023.

How much traffic does D54 Danbury over Creek carry?

About 319 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is D54 Danbury over Creek?

The structure is 27 ft (8.2 m) long with a longest span of 11 ft (3.4 m).

Who owns D54 Danbury over Creek?

It is owned by the County Highway Agency.