US Bridges

305th Trail over Stream

Good

Guthrie County, Iowa · 078310903 · Structure no. 000000000166811

Built
2017
8 years old
Condition
Good
inspected November 2020
Type
Culvert
Concrete Continuous
Length
33 ft
2 main spans
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

305th Trail over Stream is a concrete continuous culvert carrying 305th Trail over Stream in Guthrie County, Iowa. It was built in 2017, so it is 8 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 20 vehicles a day, projected to reach 20 by 2040. The structure is 33 ft (10.1 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries305th Trail
CrossesStream
Location078310903
RouteCounty Highway 0
CountyGuthrie County
StateIowa
Coordinates41.56465, -94.41872
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2020
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating87.2 US tons
Inventory rating67.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHL 93
Structure length33 ft (10.1 m)
Longest span16 ft (4.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2040
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 305th Trail over Stream built?

It was built in 2017, making it 8 years old in 2025.

What condition is 305th Trail over Stream in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2020.

How much traffic does 305th Trail over Stream carry?

About 20 vehicles per day (2022 count).

How long is 305th Trail over Stream?

The structure is 33 ft (10.1 m) long with a longest span of 16 ft (4.9 m).

Who owns 305th Trail over Stream?

It is owned by the County Highway Agency.