US Bridges

Thomas ST over Middle River

PoorPosted for load

Adair County, Iowa · 077320300 · Structure no. 000000000001010

Built
1940
85 years old
Condition
Poor
inspected March 2024
Type
Truss - Thru
Steel
Length
96 ft
1 main span
Daily traffic
120
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Thomas ST over Middle River is a steel truss - thru carrying Thomas ST over Middle River in Adair County, Iowa. It was built in 1940, so it is 85 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 3 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 2044. The structure is 96 ft (29.3 m) long and 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesThomas ST
CrossesMiddle River
Location077320300
RouteCity Street 0
CountyAdair County
StateIowa
Coordinates41.50383, -94.52456
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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating18 US tons
Inventory rating8 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length96 ft (29.3 m)
Longest span90 ft (27.4 m)
Deck width20 ft (6.2 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2022)
Projected traffic120 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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Thomas ST over Middle River built?

It was built in 1940, making it 85 years old in 2025.

What condition is Thomas ST over Middle River 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 March 2024.

How much traffic does Thomas ST over Middle River carry?

About 120 vehicles per day (2022 count).

How long is Thomas ST over Middle River?

The structure is 96 ft (29.3 m) long with a longest span of 90 ft (27.4 m) and a deck 20 ft wide.

Who owns Thomas ST over Middle River?

It is owned by the City or Municipal Highway Agency.