US Bridges

Mellotts Road over Trib of Rock River

Fair

Whiteside County, Illinois · 4 MI NE of Lyndon · Structure no. 098485400000000

Built
1973
52 years old
Condition
Fair
inspected November 2024
Type
Channel Beam
Concrete
Length
37 ft
1 main span
Daily traffic
10
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Mellotts Road over Trib of Rock River is a concrete channel beam carrying Mellotts Road over Trib of Rock River in Whiteside County, Illinois. It was built in 1973, so it is 52 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 10 vehicles a day, projected to reach 10 by 2046. The structure is 37 ft (11.2 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesMellotts Road
CrossesTrib of Rock River
Location4 MI NE of Lyndon
RouteCounty Highway 0
CountyWhiteside County
StateIllinois
Coordinates41.75798, -89.87408
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 protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating28.5 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 15
Structure length37 ft (11.2 m)
Longest span32 ft (9.8 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2022)
Projected traffic10 by 2046
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Mellotts Road over Trib of Rock River built?

It was built in 1973, making it 52 years old in 2025.

What condition is Mellotts Road over Trib of Rock River 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 November 2024.

How much traffic does Mellotts Road over Trib of Rock River carry?

About 10 vehicles per day (2022 count).

How long is Mellotts Road over Trib of Rock River?

The structure is 37 ft (11.2 m) long with a longest span of 32 ft (9.8 m) and a deck 27 ft wide.

Who owns Mellotts Road over Trib of Rock River?

It is owned by the Town or Township Highway Agency.