US-23 SB over I-75

Map

Coordinates:
+45.77221, -84.73440
45°46'20" N, 84°44'04" W

Source: National Bridge Inventory. Information not verified; use at your own risk.

Name:	US-23 SB over I-75
Structure number:	000000000002453
Old structure number:	24124071000S010 `(from 1992 edition)`
Location:	IN MACKINAW CITY
Purpose:	Carries highway over highway
Route classification:	Minor Arterial (Rural) `[06]`
Length of largest span:	112.9 ft. `[34.4 m]`
Total length:	204.1 ft. `[62.2 m]`
Roadway width between curbs:	33.1 ft. `[10.1 m]`
Deck width edge-to-edge:	37.4 ft. `[11.4 m]`
Vertical clearance below bridge:	13.1 ft. `[4.0 m]`
Skew angle:	46°
Owner:	State Highway Agency `[01]`
Year built:	1957
Historic significance:	Bridge is not eligible for the National Register of Historic Places `[5]`
Design load:	MS 18+Mod / HS 20+Mod `[6]`
Number of main spans:	3
Main spans material:	Steel `[3]`
Main spans design:	Stringer/Multi-beam or girder `[02]`
Deck type:	Concrete Cast-in-Place `[1]`
Wearing surface:	Latex Concrete or similar additive `[3]`

Good/Fair/Poor Condition:	Fair
Status:	Open, no restriction `[A]`
Average daily traffic:	1,954 `[as of 2007]`
Truck traffic:	9% of total traffic
Deck condition:	Fair `[5 out of 9]`
Superstructure condition:	Good `[7 out of 9]`
Substructure condition:	Fair `[5 out of 9]`
Structural appraisal:	Somewhat better than minimum adequacy to tolerate being left in place as is `[5]`
Deck geometry appraisal:	Equal to present minimum criteria `[6]`
Underclearances appraisal:	Basically intolerable requiring high priority of corrrective action `[3]`
Roadway alignment appraisal:	Equal to present minimum criteria `[6]`
Scour condition:	Bridge not over waterway. `[N]`
Sufficiency rating:	78.8

Date	Condition	Deck	Superstructure	Substructure	ADT	Suff. Rating
August 2018	Fair	Fair	Good	Fair	1954	78.8
August 2016	Fair	Fair	Good	Fair	1954	78.8
August 2014	Fair	Satisfactory	Good	Satisfactory	1954	89.8
March 2014	Fair	Satisfactory	Good	Satisfactory	1954	89.8
July 2012	Fair	Satisfactory	Good	Satisfactory	1954	89.8
March 2011	Fair	Satisfactory	Good	Satisfactory	1954	89.8
March 2009	Fair	Satisfactory	Good	Satisfactory	1954	89.8
March 2007	Fair	Satisfactory	Good	Satisfactory	874	90.9
March 2005	Fair	Good	Good	Satisfactory	950	90.9
March 2003	Fair	Good	Good	Satisfactory	950	90.9
March 2001	Fair	Good	Good	Satisfactory	950	90.9
June 1999	Fair	Good	Good	Satisfactory	950	95.9
June 1997	Good	Good	Good	Good	950	88.9
August 1995	Fair	Satisfactory	Good	Good	1500	87.9
July 1993	Fair	Satisfactory	Good	Good	1500	87.9
April 1991	Good	Very Good	Good	Good	1500	87.9

Source: National Bridge Elements dataset, 2019 edition. This feature is experimental.

Element	Units	Quantity	1-Good	2-Fair	3-Poor	4-Serious
Superstructure
Steel Girder/Beam	linear ft.	1,624	0	1,620	4	0
Steel Protective Coating	sq. ft.	22,814	0	0	5,704	17,110
Deck
Reinforced Concrete Deck	sq. ft.	7,714	5,400	1,157	1,157	0
Substructure
Reinforced Concrete Column	each	9	5	3	1	0
Reinforced Concrete Abutment	linear ft.	190	189	0	1	0
Reinforced Concrete Pier Cap	linear ft.	110	39	56	15	0
Joints
Pourable Joint	linear ft.	98	98	0	0	0
Other Joint	linear ft.	98	97	0	0	1
Bearings
Movable Bearing	each	24	0	18	6	0
Fixed Bearing	each	24	0	24	0	0
Bridge Rail
Reinforced Concrete Bridge Rail	linear ft.	412	208	0	204	0