State Bridge Profile Idaho 2016

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State Bridge Profile Idaho 2016 2016-02-29T10:06:46+00:00
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Idaho Highlights from FHWA’s
2015 National Bridge Inventory Data:

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  • Of the 4,369 bridges in the state, 385, or 9%, are classified as structurally deficient. This means one or more of the key bridge elements, such as the deck, superstructure or substructure, is considered to be in “poor” or worse condition.1
  • 450 bridges, or 10%, are classified as functionally obsolete. This means the bridge does not meet design standards in line with current practice.
  • Federal investment in Idaho has supported $509.5 million for capital improvements on 610 bridge projects between 2005 and 2014.2
  • Since 2004, 353 new bridges have been constructed in the state; 77 have undergone major reconstruction
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Ranking

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Top Most Traveled Structurally Deficient Bridges in the State

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CountyYear BuiltDaily CrossingsType of Bridge3Location
Ada195625,000Urban other principal arterialUS 20 ;I 84B over Boise River(Broadway Br) in Boise;Broadway Ave
Bonneville195723,000Urban minor arterialSMA 7406;17th St over Sand Creek in Ammon;17th Street
Ada196919,250Urban InterstateI 84 WBL over UPRR;Gowen Spur at 1.3 E. Boise
Nez Perce198217,500Urban minor arterialSouthway Brige
Bannock196214,000Urban InterstateI 15 SBL over I 86 EB Ramp at 2.9 N. Pocatello
Bannock196214,000Urban InterstateI 15 SBL over I 86 WB Ramp at 2.7 N. Pocatello
Canyon195613,000Urban other principal arterialSTP 7773;10th Ave over Indian Creek in Caldwell;10th Ave
Bannock196713,000Urban other principal arterialSTP 7151;Benton St over First Ave;UPRR;Benton Op in Pocatello;Benton St.
Kootenai196010,500Urban InterstateI 90 WBL over STC 7405;Penn.Ave.Gs in Coeur D Alene;Penn.Ave
Ada196310,500Rural InterstateI 84 EBL over Kuna Rd;Blacks Creek IC at 9.2 E. Boise Ecl
Bonneville195110,000Urban collectorStc7046;Lincoln Rd over Sand Creek at 0.3 W. Lincoln
Fremont19797,500Rural arterialUS 20 EBL & WBL over Farmers Friend Canal at 1.5 E. St Anthony
Minidoka19607,250Rural InterstateI 84 EBL over Snake River at 7.9 E. Burley
Minidoka19607,250Rural InterstateI 84 WBL over Snake River at 7.9 E. Burley
Shoshone19657,000Rural InterstateI 90 EBL over Pinehurst Road Gs at 4.7 W. Kellogg
Shoshone19657,000Rural InterstateI 90 WBL over Pinehurst Road Gs at 4.7 W. Kellogg
Bingham19366,000Urban minor arterialSMA 7611;W. Bridge over Snake River in Blackfoot;W.Bridge St.
Owyhee19556,000Rural arterialSH 55 over Snake River(Marsing Br) near Marsing Ecl
Shoshone19695,750Rural InterstateI 90 EBL over Elizabeth Park Road Gs at 1.8 E. Kellogg
Shoshone19695,750Rural InterstateI 90 WBL over Elizabeth Park Road Gs at 1.8 E. Kellogg
Shoshone19675,700Rural major collectorStc 5764 Main St over Pine Creek at Pinehurst Wcl
Nez Perce19625,700Rural arterialUS 95 over Nprr;Clearwater River at 4 N. Lapwai
Boise19345,100Rural arterialSH 55 over Payette River at Horseshoe Bend Scl
Bonner19664,700Rural minor arterialSH 41 over Burlington Northern RR in Oldtown
Canyon19354,200Urban collectorStc 7863;S.5th Ave over Indian Creek in Caldwell;S. 5th Ave.
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Bridge Inventory

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Type of Bridge3Number of BridgesArea of All Bridges (sq. meters)Daily Crossings on All BridgesNumber of Structurally Deficient BridgesArea of Structurally Deficient Bridges (sq. meters)Daily Crossings on Structurally Deficient Bridges
Rural Interstate279217,7781,815,20089,74050,520
Rural arterial319278,2271,481,7171312,90549,900
Rural minor arterial235123,914460,43089,96615,300
Rural major collector724254,102735,5745020,45343,040
Rural minor collector26853,68067,010275,6125,157
Rural local road1,892259,319256,41825231,97625,124
Urban Interstate111104,7262,205,40043,21557,750
Urban freeway/expressway000000
Urban other principal arterial189249,9732,732,76038,75651,000
Urban minor arterial14697,8991,260,548415,54248,200
Urban collector10633,971311,57092,87430,800
Urban local road10029,911102,28071,1578,060
Total4,3691,703,50011,428,907385122,196384,851
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Proposed Bridge Work

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Type of WorkNumber of BridgesCost to Repair (in millions)Daily CrossingsArea of Bridges (sq. meters)
Bridge replacement1,402$2,121.62,999,336553,710
Widening & rehabilitation62$59.6272,77429,766
Rehabilitation26$108.481,80027,769
Deck rehabilitation/replacement8$6.739,41012,337
Other structural work10$6.244,9773,730
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1 According to the Federal Highway Administration (FHWA), a bridge is classified as structurally deficient if the condition rating for the deck, superstructure, substructure or culvert and retaining walls is rated 4 or below or if the bridge receives an appraisal rating of 2 or less for structural condition or waterway adequacy. During inspections, the condition of a variety of bridge elements are rated on a scale of 0 (failed condition) to 9 (excellent condition). A rating of 4 is considered “poor” condition and the individual element displays signs of advanced section loss, deterioration, spalling or scour.
2 This data is provided by bridge owners as part of the FHWA data and is required for any bridge eligible for the Highway Bridge Replacement

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Sources: All data is from the 2014 National Bridge Inventory, released by the Federal Highway Administration in January 2015. Note that specific conditions on bridge may have changed as a result of recent work. Cost estimates of bridge work provided as part of the data and have been adjusted to 2014$ for inflation and estimated project costs. Contract awards data is for state and local government awards and comes from McGraw Hill. Note that additional bridge investment may be a part of other contract awards if a smaller bridge project is included with a highway project, and that would not be accounted for in the total in this profile.

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