S 21 over INT MIDWAY I 15

Map

Coordinates:
+48.13024, -111.90347
48°07'49" N, 111°54'12" W

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

Name:	S 21 over INT MIDWAY I 15
Structure number:	P00021000+00001
Location:	3M SE CONRAD
Purpose:	Carries highway overpass over highway
Route classification:	Minor Arterial (Rural) `[06]`
Length of largest span:	105.6 ft. `[32.2 m]`
Total length:	349.1 ft. `[106.4 m]`
Roadway width between curbs:	43.6 ft. `[13.3 m]`
Deck width edge-to-edge:	46.3 ft. `[14.1 m]`
Vertical clearance below bridge:	16.4 ft. `[5.0 m]`
Skew angle:	28°
Owner:	State Highway Agency `[01]`
Year built:	1972
Historic significance:	Bridge is not eligible for the National Register of Historic Places `[5]`
Number of main spans:	4
Main spans material:	Steel continuous `[4]`
Main spans design:	Stringer/Multi-beam or girder `[02]`
Deck type:	Concrete Cast-in-Place `[1]`
Wearing surface:	Monolithic Concrete (concurrently placed with structural deck) `[1]`

Good/Fair/Poor Condition:	Fair
Status:	Open, no restriction `[A]`
Average daily traffic:	562 `[as of 2016]`
Truck traffic:	8% of total traffic
Deck condition:	Fair `[5 out of 9]`
Superstructure condition:	Good `[7 out of 9]`
Substructure condition:	Good `[7 out of 9]`
Structural appraisal:	Somewhat better than minimum adequacy to tolerate being left in place as is `[5]`
Deck geometry appraisal:	Superior to present desirable criteria `[9]`
Underclearances appraisal:	Equal to present minimum criteria `[6]`
Roadway alignment appraisal:	Better than present minimum criteria `[7]`
Scour condition:	Bridge not over waterway. `[N]`
Sufficiency rating:	85.3

Date	Condition	Deck	Superstructure	Substructure	ADT	Suff. Rating
June 2017	Fair	Fair	Good	Good	562	85.3
June 2015	Fair	Fair	Good	Good	660	99.0
July 2013	Fair	Satisfactory	Good	Good	660	100.0
July 2011	Good	Good	Good	Good	660	100.0
July 2009	Good	Good	Good	Good	640	100.0
June 2007	Good	Good	Good	Good	930	100.0
April 2005	Good	Good	Good	Good	760	100.0
April 2003	Good	Good	Good	Good	900	100.0
August 2001	Good	Good	Good	Good	900	99.0
April 1999	Good	Good	Good	Good	920	100.0
December 1996	Good	Good	Good	Good	1180	100.0
November 1994	Good	Good	Good	Good	1160	98.0
October 1992	Good	Good	Good	Good	1140	98.0
January 1991	Good	Good	Good	Good	850	98.0

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.	2,093	1,248	839	6	0
Steel Protective Coating	sq. ft.	27,209	14,965	5,442	2,721	4,081
Deck
Reinforced Concrete Deck	sq. ft.	16,114	13,590	949	1,575	0
Concrete Protective Coating	sq. ft.	16,114	0	0	5,584	10,530
Substructure
Reinforced Concrete Column	each	9	9	0	0	0
Reinforced Concrete Abutment	linear ft.	138	120	15	3	0
Reinforced Concrete Pier Cap	linear ft.	157	153	4	0	0
Joints
Assembly without Seal Joint	linear ft.	105	39	66	0	0
Bearings
Movable Bearing	each	24	12	12	0	0
Steel Protective Coating	sq. ft.	24	17	0	2	5
Fixed Bearing	each	6	6	0	0	0
Steel Protective Coating	sq. ft.	6	6	0	0	0
Bridge Rail
Steel or Aluminum Bridge Rail	linear ft.	699	0	699	0	0
Steel Protective Coating	sq. ft.	932	187	373	186	186