US Bridges

Ia 13 over Branch Maquoketa River

Fair

Delaware County, Iowa · 0.9 MI N of N Jct. SR D47 · Structure no. 000000000023211

Built
1975
50 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
4,840
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 13 over Branch Maquoketa River is a concrete continuous culvert carrying Ia 13 over Branch Maquoketa River in Delaware County, Iowa. It was built in 1975, so it is 50 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 4,840 vehicles a day, roughly 13% of them trucks, projected to reach 4,840 by 2044. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesIa 13
CrossesBranch Maquoketa River
Location0.9 MI N of N Jct. SR D47
RouteState Highway 13
CountyDelaware County
StateIowa
Coordinates42.36707, -91.48056
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 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 evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating65 US tons
Inventory rating38.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,840 (2022)
Projected traffic4,840 by 2044
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 13 over Branch Maquoketa River built?

It was built in 1975, making it 50 years old in 2025.

What condition is Ia 13 over Branch Maquoketa River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does Ia 13 over Branch Maquoketa River carry?

About 4,840 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is Ia 13 over Branch Maquoketa River?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns Ia 13 over Branch Maquoketa River?

It is owned by the State Highway Agency.