US Bridges

I 29 SB over Main Ditch NO.6

Fair

Fremont County, Iowa · 0.4 Mi. S of Jct. Ia 333 · Structure no. 000000000600040

Built
1972
53 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
179 ft
3 main spans
Daily traffic
7,300
2022 count
Owner
State
State Highway Agency

About this bridge

I 29 SB over Main Ditch NO.6 is a steel continuous stringer/multi-beam or girder carrying I 29 SB over Main Ditch NO.6 in Fremont County, Iowa. It was built in 1972, so it is 53 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 5 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 7,300 vehicles a day, roughly 39% of them trucks, projected to reach 7,300 by 2044. The structure is 179 ft (54.6 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 29 SB
CrossesMain Ditch NO.6
Location0.4 Mi. S of Jct. Ia 333
RouteInterstate 29
CountyFremont County
StateIowa
Coordinates40.59526, -95.67295
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

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

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating70.2 US tons
Inventory rating42.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length179 ft (54.6 m)
Longest span74 ft (22.6 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,300 (2022)
Projected traffic7,300 by 2044
Trucks39%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 29 SB over Main Ditch NO.6 built?

It was built in 1972, making it 53 years old in 2025.

What condition is I 29 SB over Main Ditch NO.6 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 March 2024.

How much traffic does I 29 SB over Main Ditch NO.6 carry?

About 7,300 vehicles per day (2022 count), of which roughly 39% are trucks.

How long is I 29 SB over Main Ditch NO.6?

The structure is 179 ft (54.6 m) long with a longest span of 74 ft (22.6 m) and a deck 43 ft wide.

Who owns I 29 SB over Main Ditch NO.6?

It is owned by the State Highway Agency.