IL 171 (1ST AVE) over SILVER CREEK (Route: 171)
Num:16069800000000x
Open: no restriction [A]
Built: 1934, Reconstructed: 1989
Historic: Bridge is not eligible for the NRHP. [5]

Google Streetview (If Available)

Rough Distance: 0.3 Miles (0.5 Kilometers)

Bridge Type
Main Span(s): Concrete [1] Tee beam [04]
Approach Span(s): Other [00]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Integral Concrete (separate non-modified layer of concrete added to structural deck) [2]

Bridge Dimensions
Length: 10.1 m = 33.1 ft
Main Spans: 1 at 9.4 m = 30.8 ft
Approach Spans: 0
Skew: 0
Width, Roadway: 14.6 m = 47.9 ft (4 Lanes) and Out-To-Out: 18.3 m = 60.0 ft for a 14.6 m = 47.9 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A

Location
Unknown [03635]: Cook County [031], Illinois [17]
Owned by State Highway Agency [01], DOT District: 1
0.6 M N LAKE ST

Condition
Deck: Satisfactory [6]
Superstructure: Satisfactory [6]
Substructure: Satisfactory [6]
Loading
Design: MS 18 / HS 20 [5]
Operating: 59.9 metric ton = 65.9 tons (Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading [6])
Inventory: 36 metric ton = 39.6 tons (Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading [6])

Appraisal
Structural: Equal to present minimum criteria [6]
Deck Geometry: Basically intolerable requiring high priority of replacement [2]
Road Alignment: Equal to present desirable criteria [8]
Waterway: Equal to present desirable criteria [8] and Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Inspections
Date: June 2020 [0620] and Frequency: 24

Future Work
Work Needed: Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Bridge Detour: 0.2 km = 0.1 mi
Traffic
ADT: 25100 (2019) and Trucks: 12%
Future ADT: 28428 (In 2032 )

9TH AVE. over SILVER CREEK (Route: 0)
Num:16747500000000x
Posted for load [P]
Built: 1955, Reconstructed: N/A [0000]
Historic: Bridge is not eligible for the NRHP. [5]

Google Streetview (If Available)

Rough Distance: 0.5 Miles (0.8 Kilometers)

Bridge Type
Main Span(s): Steel [3] Stringer/Multi-beam or girder [02]
Approach Span(s): Other [00]
Deck: Concrete Cast-in-Place [1] with Wearing Surface: Bituminous [6]

Bridge Dimensions
Length: 18.3 m = 60.0 ft
Main Spans: 1 at 17.7 m = 58.1 ft
Approach Spans: 0
Skew: 35
Width, Roadway: 11 m = 36.1 ft (2 Lanes) and Out-To-Out: 14.6 m = 47.9 ft for a 11 m = 36.1 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A

Location
Unknown [03660]: Cook County [031], Illinois [17]
Owned by City or Municipal Highway Agency [04], DOT District: 1
0.2M.S.OF IL-64

Condition
Deck: Serious [3]
Superstructure: Poor [4]
Substructure: Poor [4]
Loading
Design:
Operating: 29.2 metric ton = 32.1 tons ()
Inventory: 17.5 metric ton = 19.3 tons ()

Appraisal
Structural: Meets minimum tolerable limits to be left in place as is [4]
Deck Geometry: Meets minimum tolerable limits to be left in place as is [4]
Road Alignment: Equal to present desirable criteria [8]
Waterway: Superior to present desirable criteria [9] and Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Inspections
Date: December 1999 [1299] and Frequency: 24

Future Work
Work Needed:
Bridge Detour: 0.5 km = 0.3 mi
Traffic
ADT: 7500 (2018) and Trucks: 6%
Future ADT: 8961 (In 2032 )