US Bridges

TR-704 over Lake Dam

Fair

Clay County, Illinois · Charlie Brwn Flora · Structure no. 013600000000000

Built
1932
93 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
42 ft
2 main spans
Daily traffic
125
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

TR-704 over Lake Dam is a concrete slab carrying TR-704 over Lake Dam in Clay County, Illinois. It was built in 1932, so it is 93 years old, older than the Illinois average of 45.3 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 125 vehicles a day, roughly 32% of them trucks, projected to reach 126 by 2046. The structure is 42 ft (12.8 m) long and 21 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesTR-704
CrossesLake Dam
LocationCharlie Brwn Flora
RouteCounty Highway 0
CountyClay County
StateIllinois
Coordinates38.66379, -88.53649
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
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
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 15
Structure length42 ft (12.8 m)
Longest span21 ft (6.4 m)
Deck width21 ft (6.3 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (2021)
Projected traffic126 by 2046
Trucks32%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was TR-704 over Lake Dam built?

It was built in 1932, making it 93 years old in 2025.

What condition is TR-704 over Lake Dam 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 TR-704 over Lake Dam carry?

About 125 vehicles per day (2021 count), of which roughly 32% are trucks.

How long is TR-704 over Lake Dam?

The structure is 42 ft (12.8 m) long with a longest span of 21 ft (6.4 m) and a deck 21 ft wide.

Who owns TR-704 over Lake Dam?

It is owned by the City or Municipal Highway Agency.