US Bridges

Park Access Road over Lk Murphy Spillway

Good

Jackson County, Illinois · Lk Murphysboro ST Pk · Structure no. 039990700000000

Built
1958
67 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
113 ft
2 main spans
Daily traffic
75
2022 count
Owner
State
State Park, Forest, or Reservation Agency

About this bridge

Park Access Road over Lk Murphy Spillway is a steel continuous stringer/multi-beam or girder carrying Park Access Road over Lk Murphy Spillway in Jackson County, Illinois. It was built in 1958, so it is 67 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 75 vehicles a day, roughly 4% of them trucks, projected to reach 101 by 2046. The structure is 113 ft (34.4 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesPark Access Road
CrossesLk Murphy Spillway
LocationLk Murphysboro ST Pk
CountyJackson County
StateIllinois
Coordinates37.7734, -89.38098
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating43.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadH 15
Structure length113 ft (34.4 m)
Longest span48 ft (14.7 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2022)
Projected traffic101 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Park, Forest, or Reservation Agency
Maintained byState Park, Forest, or Reservation Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$299,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Park Access Road over Lk Murphy Spillway built?

It was built in 1958, making it 67 years old in 2025.

What condition is Park Access Road over Lk Murphy Spillway in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does Park Access Road over Lk Murphy Spillway carry?

About 75 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Park Access Road over Lk Murphy Spillway?

The structure is 113 ft (34.4 m) long with a longest span of 48 ft (14.7 m) and a deck 20 ft wide.

Who owns Park Access Road over Lk Murphy Spillway?

It is owned by the State Park, Forest, or Reservation Agency.