US Bridges

Blairs Ferry RD over Mud Lake

Fair

Linn County, Iowa · 084082205 · Structure no. 000000000362230

Built
1984
41 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
364 ft
4 main spans
Daily traffic
4,419
2022 count
Owner
County
County Highway Agency

About this bridge

Blairs Ferry RD over Mud Lake is a prestressed concrete continuous stringer/multi-beam or girder carrying Blairs Ferry RD over Mud Lake in Linn County, Iowa. It was built in 1984, so it is 41 years old, younger 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 4,419 vehicles a day, projected to reach 4,419 by 2044. The structure is 364 ft (110.9 m) long and 45 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

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CarriesBlairs Ferry RD
CrossesMud Lake
Location084082205
RouteCounty Highway 0
CountyLinn County
StateIowa
Coordinates42.06673, -91.77296
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length364 ft (110.9 m)
Longest span95 ft (29 m)
Deck width45 ft (13.7 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,419 (2022)
Projected traffic4,419 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Blairs Ferry RD over Mud Lake built?

It was built in 1984, making it 41 years old in 2025.

What condition is Blairs Ferry RD over Mud Lake 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 September 2024.

How much traffic does Blairs Ferry RD over Mud Lake carry?

About 4,419 vehicles per day (2022 count).

How long is Blairs Ferry RD over Mud Lake?

The structure is 364 ft (110.9 m) long with a longest span of 95 ft (29 m) and a deck 45 ft wide.

Who owns Blairs Ferry RD over Mud Lake?

It is owned by the County Highway Agency.