US Bridges

FAP 685 Ill 9 over Mississippi River

Poor

Hancock County, Illinois · Fort Madison Iowa · Structure no. 034990200000000

Built
1927
98 years old, rebuilt 1980
Condition
Poor
inspected September 2009
Type
Movable - Swing
Steel
Length
3,347 ft
1 main span
Daily traffic
2,500
2023 count
Owner
Railroad
Railroad

About this bridge

FAP 685 Ill 9 over Mississippi River is a steel movable - swing carrying FAP 685 Ill 9 over Mississippi River in Hancock County, Illinois. It was built in 1927 and reconstructed in 1980, so it is 98 years old, older than the Illinois average of 45.3 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.

It carries about 2,500 vehicles a day, roughly 2% of them trucks, projected to reach 2,727 by 2046. The structure is 3,347 ft (1,020.2 m) long and 25 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

CarriesFAP 685 Ill 9
CrossesMississippi River
LocationFort Madison Iowa
RouteState Highway 9
Coordinates40.62307, -91.29179
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.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2009
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+23 approach)
Design loadH 20
Structure length3,347 ft (1,020.2 m)
Longest span525 ft (160 m)
Deck width25 ft (7.6 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deck15 ft (4.4 m)

Traffic and service

Average daily traffic2,500 (2023)
Projected traffic2,727 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and railroad
CrossesWaterway
Detour if closed49.7 mi (80 km)
TollToll bridge
National Highway SystemNo

Ownership and planned work

OwnerRailroad
Maintained byRailroad
Historic statusListed on the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$11 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was FAP 685 Ill 9 over Mississippi River built?

It was built in 1927, making it 98 years old in 2025. It was reconstructed in 1980.

What condition is FAP 685 Ill 9 over Mississippi 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 September 2009.

How much traffic does FAP 685 Ill 9 over Mississippi River carry?

About 2,500 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is FAP 685 Ill 9 over Mississippi River?

The structure is 3,347 ft (1,020.2 m) long with a longest span of 525 ft (160 m) and a deck 25 ft wide.

Who owns FAP 685 Ill 9 over Mississippi River?

It is owned by the Railroad.