I 15 over SILVERBOW CREEK-RR

Map

Coordinates:
+45.99640, -112.56339
45°59'47" N, 112°33'48" W

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

Name:	I 15 over SILVERBOW CREEK-RR
Structure number:	I00015125+00842
Location:	1.2M W BUTTE
Purpose:	Carries highway over railroad and waterway
Route classification:	Principal Arterial - Interstate (Rural) `[01]`
Length of largest span:	104.0 ft. `[31.7 m]`
Total length:	488.9 ft. `[149.0 m]`
Roadway width between curbs:	27.9 ft. `[8.5 m]`
Deck width edge-to-edge:	31.8 ft. `[9.7 m]`
Vertical clearance below bridge:	23.0 ft. `[7.0 m]`
Owner:	State Highway Agency `[01]`
Year built:	1964
Historic significance:	Bridge is not eligible for the National Register of Historic Places `[5]`
Design load:	MS 18 / HS 20 `[5]`
Main span material:	Steel `[3]`
Main span design:	Stringer/Multi-beam or girder `[02]`
Deck type:	Concrete Cast-in-Place `[1]`
Wearing surface:	Bituminous `[6]`

Good/Fair/Poor Condition:	Fair
Status:	Open, no restriction `[A]`
Average daily traffic:	6,734 `[as of 2017]`
Truck traffic:	15% of total traffic
Deck condition:	Satisfactory `[6 out of 9]`
Superstructure condition:	Satisfactory `[6 out of 9]`
Substructure condition:	Satisfactory `[6 out of 9]`
Structural appraisal:	Equal to present minimum criteria `[6]`
Deck geometry appraisal:	Basically intolerable requiring high priority of corrrective action `[3]`
Underclearances appraisal:	Somewhat better than minimum adequacy to tolerate being left in place as is `[5]`
Water adequacy appraisal:	Equal to present desirable criteria `[8]`
Roadway alignment appraisal:	Better than present minimum criteria `[7]`
Channel protection:	Banks are protected or well vegetated. River control devices such as spur dikes and embankment protection are not required or are in a stable condition. `[8]`
Scour condition:	Bridge foundations determined to be stable for assessed or calculated scour condition. `[5]`
Sufficiency rating:	75.6
Recommended work:	Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. `[31]`
Estimated cost of work:	$1,382,000

Date	Condition	Deck	Superstructure	Substructure	ADT	Suff. Rating
October 2018	Fair	Satisfactory	Satisfactory	Satisfactory	6734	75.6
October 2016	Fair	Satisfactory	Satisfactory	Satisfactory	6795	75.6
October 2014	Fair	Satisfactory	Good	Good	11920	77.3
October 2012	Fair	Satisfactory	Good	Good	11920	77.3
October 2010	Good	Good	Good	Good	11920	77.3
November 2008	Good	Good	Good	Good	11410	77.3
December 2006	Good	Good	Good	Good	12530	77.2
August 2004	Fair	Satisfactory	Good	Good	13550	77.2
March 2002	Fair	Satisfactory	Good	Good	12800	77.2
June 1999	Fair	Satisfactory	Good	Good	12960	77.2
April 1997	Fair	Satisfactory	Good	Good	10200	77.4
May 1995	Fair	Satisfactory	Good	Good	10200	77.0
June 1993	Fair	Satisfactory	Good	Good	8220	77.2
November 1990	Fair	Fair	Satisfactory	Satisfactory	7630	76.2

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.	417	149	170	98	0
Steel Protective Coating	sq. ft.	6,433	5,082	322	643	386
Prestressed Concrete Girder/Beam	linear ft.	1,919	1,842	77	0	0
Deck
Reinforced Concrete Deck	sq. ft.	15,489	15,113	376	0	0
Wearing Surfaces	sq. ft.	15,489	15,213	0	276	0
Substructure
Reinforced Concrete Column	each	9	8	0	1	0
Reinforced Concrete Abutment	linear ft.	82	50	32	0	0
Reinforced Concrete Pier Cap	linear ft.	197	168	29	0	0
Joints
Pourable Joint	linear ft.	219	0	45	55	119
Bearings
Movable Bearing	each	38	0	38	0	0
Steel Protective Coating	sq. ft.	38	0	0	28	10
Fixed Bearing	each	38	0	38	0	0
Steel Protective Coating	sq. ft.	38	16	0	12	10
Bridge Rail
Reinforced Concrete Bridge Rail	linear ft.	978	652	326	0	0