US Bridges

FM Rt M-36 over East Boyer River

Poor

Crawford County, Iowa · 083391304 · Structure no. 000000000127810

Built
1958
67 years old, rebuilt 1988
Condition
Poor
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
205 ft
3 main spans
Daily traffic
1,951
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

FM Rt M-36 over East Boyer River is a prestressed concrete stringer/multi-beam or girder carrying FM Rt M-36 over East Boyer River in Crawford County, Iowa. It was built in 1958 and reconstructed in 1988, so it is 67 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 1,951 vehicles a day, roughly 6% of them trucks, projected to reach 1,951 by 2044. The structure is 205 ft (62.5 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesFM Rt M-36
CrossesEast Boyer River
Location083391304
RouteCounty Highway 0
StateIowa
Coordinates42.00867, -95.33438
Functional classUrban Minor Arterial

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.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating54.7 US tons
Inventory rating15.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length205 ft (62.5 m)
Longest span69 ft (21 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,951 (2022)
Projected traffic1,951 by 2044
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.4 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM Rt M-36 over East Boyer River built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1988.

What condition is FM Rt M-36 over East Boyer 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 April 2024.

How much traffic does FM Rt M-36 over East Boyer River carry?

About 1,951 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is FM Rt M-36 over East Boyer River?

The structure is 205 ft (62.5 m) long with a longest span of 69 ft (21 m) and a deck 26 ft wide.

Who owns FM Rt M-36 over East Boyer River?

It is owned by the City or Municipal Highway Agency.