US Bridges

Emerald RD Ch 17 over Flat Branch

Fair

Clinton County, Illinois · 0.7 Miles W. ILL127 · Structure no. 014511000000000

Built
1999
26 years old
Condition
Fair
inspected January 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
152 ft
3 main spans
Daily traffic
350
2020 count
Owner
County
County Highway Agency

About this bridge

Emerald RD Ch 17 over Flat Branch is a prestressed concrete box beam or girders - multiple carrying Emerald RD Ch 17 over Flat Branch in Clinton County, Illinois. It was built in 1999, so it is 26 years old, younger 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 350 vehicles a day, roughly 23% of them trucks, projected to reach 385 by 2046. The structure is 152 ft (46.2 m) long and 28 ft wide.

Location

Open in Google Maps
CarriesEmerald RD Ch 17
CrossesFlat Branch
Location0.7 Miles W. ILL127
RouteCounty Highway 0
CountyClinton County
StateIllinois
Coordinates38.71207, -89.38463
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length152 ft (46.2 m)
Longest span50 ft (15.2 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2020)
Projected traffic385 by 2046
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Emerald RD Ch 17 over Flat Branch built?

It was built in 1999, making it 26 years old in 2025.

What condition is Emerald RD Ch 17 over Flat Branch 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 January 2025.

How much traffic does Emerald RD Ch 17 over Flat Branch carry?

About 350 vehicles per day (2020 count), of which roughly 23% are trucks.

How long is Emerald RD Ch 17 over Flat Branch?

The structure is 152 ft (46.2 m) long with a longest span of 50 ft (15.2 m) and a deck 28 ft wide.

Who owns Emerald RD Ch 17 over Flat Branch?

It is owned by the County Highway Agency.