US Bridges

Rt 630 Bp 129 over South Fork Sangamon

Fair

Sangamon County, Illinois · 2.5 S of Riverton · Structure no. 084344600000000

Built
1981
44 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
497 ft
4 main spans
Daily traffic
2,800
2022 count
Owner
County
County Highway Agency

About this bridge

Rt 630 Bp 129 over South Fork Sangamon is a steel continuous stringer/multi-beam or girder carrying Rt 630 Bp 129 over South Fork Sangamon in Sangamon 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 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 2,800 vehicles a day, roughly 5% of them trucks, projected to reach 1,818 by 2046. The structure is 497 ft (151.5 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesRt 630 Bp 129
CrossesSouth Fork Sangamon
Location2.5 S of Riverton
CountySangamon County
StateIllinois
Coordinates39.80202, -89.54206
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length497 ft (151.5 m)
Longest span138 ft (42.1 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2022)
Projected traffic1,818 by 2046
Trucks5%
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

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 Rt 630 Bp 129 over South Fork Sangamon built?

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

What condition is Rt 630 Bp 129 over South Fork Sangamon 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 March 2023.

How much traffic does Rt 630 Bp 129 over South Fork Sangamon carry?

About 2,800 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Rt 630 Bp 129 over South Fork Sangamon?

The structure is 497 ft (151.5 m) long with a longest span of 138 ft (42.1 m) and a deck 33 ft wide.

Who owns Rt 630 Bp 129 over South Fork Sangamon?

It is owned by the County Highway Agency.