US Bridges

Frog Pond RD over Lynn Creek

Fair

Whiteside County, Illinois · 6.5 MI N of Erie · Structure no. 098415800000000

Built
1981
44 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
41 ft
1 main span
Daily traffic
100
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Frog Pond RD over Lynn Creek is a prestressed concrete box beam or girders - multiple carrying Frog Pond RD over Lynn Creek in Whiteside County, Illinois. It was built in 1981, so it is 44 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 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 100 vehicles a day, roughly 37% of them trucks, projected to reach 101 by 2046. The structure is 41 ft (12.6 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesFrog Pond RD
CrossesLynn Creek
Location6.5 MI N of Erie
RouteCounty Highway 0
CountyWhiteside County
StateIllinois
Coordinates41.75835, -90.11136
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.4 US tons
Inventory rating34 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length41 ft (12.6 m)
Longest span41 ft (12.5 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2021)
Projected traffic101 by 2046
Trucks37%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Frog Pond RD over Lynn Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is Frog Pond RD over Lynn Creek 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 Frog Pond RD over Lynn Creek carry?

About 100 vehicles per day (2021 count), of which roughly 37% are trucks.

How long is Frog Pond RD over Lynn Creek?

The structure is 41 ft (12.6 m) long with a longest span of 41 ft (12.5 m) and a deck 28 ft wide.

Who owns Frog Pond RD over Lynn Creek?

It is owned by the Town or Township Highway Agency.