US Bridges

300th ST over Johns Creek

PoorPosted for load

Plymouth County, Iowa · 090441301 · Structure no. 000000000270950

Built
1900
125 years old
Condition
Poor
inspected August 2024
Type
Truss - Thru
Steel
Length
80 ft
1 main span
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

300th ST over Johns Creek is a steel truss - thru carrying 300th ST over Johns Creek in Plymouth County, Iowa. It was built in 1900, so it is 125 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 26 vehicles a day, projected to reach 26 by 2044. The structure is 80 ft (24.4 m) long and 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries300th ST
CrossesJohns Creek
Location090441301
RouteCounty Highway 0
CountyPlymouth County
StateIowa
Coordinates42.61914, -95.98867
Functional classRural Local

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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating19.4 US tons
Inventory rating11.6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckSteel plate
Main spans1
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span80 ft (24.4 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 by 2044
Trucks0%
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$315,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 300th ST over Johns Creek built?

It was built in 1900, making it 125 years old in 2025.

What condition is 300th ST over Johns 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 August 2024.

How much traffic does 300th ST over Johns Creek carry?

About 26 vehicles per day (2022 count).

How long is 300th ST over Johns Creek?

The structure is 80 ft (24.4 m) long with a longest span of 80 ft (24.4 m) and a deck 20 ft wide.

Who owns 300th ST over Johns Creek?

It is owned by the County Highway Agency.