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Bridge Statistics for Willow, Alaska (AK)
Condition, Traffic, Stress, Structural Evaluation, Project Costs


  • National Bridge Inventory (NBI) Statistics
  • 10Number of bridges
  • 101m331ftTotal length
  • 13,929Total average daily traffic
  • 2,201Total average daily truck traffic
  • 18,515Total future (year 2032) average daily traffic
  • National Bridge Inventory (NBI) Registered Bridges for Willow
  • No street view available for this location

New bridges - Historical Statistics

  • 31960-1969
  • 51970-1979
  • 12000-2009
  • 12010-2015

Reconstructed bridges - Historical Statistics

  • 11980-1989
  • 01990-1999
  • 12000-2009

Average Daily Traffic

Average Truck Traffic (%)

Bridge Condition - Deck

Bridge Condition - Superstructure

Bridge Condition - Substructure

Bridge Condition - Channel

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Structure Number: 211,  Location: MILE POINT 39.8 (Lat: 61.809761,  Lng: -150.097139),  Route carried "on" structure: Interstate A41,  Year Built: 1962,  Status: Open,  Structure Length: 4.11m (13.48ft),  Average Daily Traffic: 2,876 (year 2013),  Truck Traffic: 14%,  Average Future Daily Traffic: 2,900 (year 2032),  Design Load: HS 20,  Features Intersected: LITTLE WILLOW CREEK,  Facility Carried by Structure: PARKS HIGHWAY
Minimum Vertical Clearance: 5.41m (17.75ft),  Kilometerpoint: 64.038,  Lanes on structure: 2,  Base Highway Network: Yes,  Owner: State Highway Agency,  Approaching Roadway Width: 9.8m (32.2ft),  Material/Design: Prestressed concrete,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 1,  Number Of Approach Spans: 2,  Length of Maximum Span: 18.9m (62.0ft),  Curb or Sidewalk Widths: Left: 0.5m (1.6ft),  Right: 0.5m (1.6ft),  Curb-To-Curb Width: 8.5m (27.9ft),  Out-to-Out Width: 10.1m (33.1ft)

Condition: Deck: Satisfactory,  Superstructure: Fair,  Substructure: Satisfactory,  Channel: Very good,  Operating Rating: 52.3 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF),  Inventory Rating: 24.0 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Somewhat better than minimum adequacy,  Deck Geometry: Meets minimum limits,  Waterway Adequacy: Equal to present desirable criteria,  Approach Roadway Alignment: Equal to present desirable criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: June 14,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Bituminous
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Structure Number: 254,  Location: MILE POINT 69.3 (Lat: 62.175633,  Lng: -150.175111),  Route carried "on" structure: Interstate A42,  Year Built: 1965,  Status: Open,  Structure Length: 32.67m (107.19ft),  Average Daily Traffic: 1,930 (year 2013),  Truck Traffic: 16%,  Average Future Daily Traffic: 1,700 (year 2032),  Design Load: HS 20,  Features Intersected: SUSITNA RIVER,  Facility Carried by Structure: PARKS HIGHWAY
Minimum Vertical Clearance: 5.41m (17.75ft),  Kilometerpoint: 111.504,  Lanes on structure: 2,  Base Highway Network: Yes,  Owner: State Highway Agency,  Approaching Roadway Width: 12.2m (40.0ft),  Material/Design: Steel continuous,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 5,  Length of Maximum Span: 76.2m (250.0ft),  Curb or Sidewalk Widths: Left: 0.5m (1.6ft),  Right: 0.5m (1.6ft),  Curb-To-Curb Width: 9.1m (29.9ft),  Out-to-Out Width: 10.3m (33.8ft)

Condition: Deck: Good,  Superstructure: Satisfactory,  Substructure: Satisfactory,  Channel: Good,  Operating Rating: 80.0 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF),  Inventory Rating: 33.8 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Equal to present minimum criteria,  Deck Geometry: Somewhat better than minimum adequacy,  Waterway Adequacy: Equal to present desirable criteria,  Approach Roadway Alignment: Equal to present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Critical Feature Inspection Frequency: Every 24 months,  Underwater Inspection Frequency: Every 60 months,  Inspection Date: June 14,  Critical Feature Inspection Date: June 14,  Underwater Inspection Date: September 13,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Monolithic Concrete
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Structure Number: 255,  Location: MILE POINT 98.3 (Lat: 62.565269,  Lng: -150.233169),  Route carried "on" structure: Interstate A42,  Year Built: 1970,  Year Reconstructed: 1993,  Status: Open,  Structure Length: 24.08m (79.00ft),  Average Daily Traffic: 1,080 (year 2013),  Truck Traffic: 23%,  Average Future Daily Traffic: 1,400 (year 2032),  Design Load: HS 25,  Features Intersected: CHULITNA RIVER,  Facility Carried by Structure: PARKS HIGHWAY
Minimum Vertical Clearance: 5.41m (17.75ft),  Kilometerpoint: 158.165,  Lanes on structure: 2,  Base Highway Network: Yes,  Owner: State Highway Agency,  Approaching Roadway Width: 12.2m (40.0ft),  Skew: 2 degrees,  Material/Design: Steel continuous,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 5,  Length of Maximum Span: 67.1m (220.1ft),  Curb-To-Curb Width: 12.2m (40.0ft),  Out-to-Out Width: 12.9m (42.3ft)

Condition: Deck: Good,  Superstructure: Satisfactory,  Substructure: Very good,  Channel: Very good,  Operating Rating: 66.6 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF),  Inventory Rating: 32.5 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Equal to present minimum criteria,  Deck Geometry: Better than present minimum criteria,  Waterway Adequacy: Superior to present desirable criteria,  Approach Roadway Alignment: Equal to present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Underwater Inspection Frequency: Every 60 months,  Other Special Inspection Frequency: Every 24 months,  Inspection Date: June 14,  Underwater Inspection Date: September 13,  Other Special Inspection Date: May 13,  Deck Structure Type: Concrete Precast Panels,  Wearing Surface/Protective System: Wearing Surface: Bituminous,  Membrane: Preformed Fabric,  Deck Protection: Epoxy Coated Reinforcing
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Structure Number: 256,  Location: MILE POINT 102.9 (Lat: 62.626981,  Lng: -150.227656),  Route carried "on" structure: Interstate A42,  Year Built: 1970,  Status: Open,  Structure Length: 4.05m (13.29ft),  Average Daily Traffic: 1,080 (year 2013),  Truck Traffic: 23%,  Average Future Daily Traffic: 1,400 (year 2032),  Design Load: HS 20,  Features Intersected: TROUBLESOME CREEK,  Facility Carried by Structure: PARKS HIGHWAY
Minimum Vertical Clearance: 5.41m (17.75ft),  Kilometerpoint: 165.566,  Lanes on structure: 2,  Base Highway Network: Yes,  Owner: State Highway Agency,  Approaching Roadway Width: 12.2m (40.0ft),  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 2,  Length of Maximum Span: 19.8m (65.0ft),  Curb-To-Curb Width: 12.7m (41.7ft),  Out-to-Out Width: 13.0m (42.7ft)

Condition: Deck: Good,  Superstructure: Good,  Substructure: Satisfactory,  Channel: Good,  Operating Rating: 76.6 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF),  Inventory Rating: 35.3 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Equal to present minimum criteria,  Deck Geometry: Better than present minimum criteria,  Waterway Adequacy: Better than present minimum criteria,  Approach Roadway Alignment: Equal to present desirable criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: June 14,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Monolithic Concrete
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Structure Number: 257,  Location: MILE POINT 109.5 (Lat: 62.712439,  Lng: -150.204981),  Route carried "on" structure: Interstate A42,  Year Built: 1970,  Status: Open,  Structure Length: 4.18m (13.71ft),  Average Daily Traffic: 1,080 (year 2013),  Truck Traffic: 23%,  Average Future Daily Traffic: 1,400 (year 2032),  Design Load: HS 20,  Features Intersected: BYERS CREEK,  Facility Carried by Structure: PARKS HIGHWAY
Minimum Vertical Clearance: 5.41m (17.75ft),  Kilometerpoint: 176.186,  Lanes on structure: 2,  Base Highway Network: Yes,  Owner: State Highway Agency,  Approaching Roadway Width: 12.2m (40.0ft),  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 3,  Length of Maximum Span: 13.7m (44.9ft),  Curb-To-Curb Width: 12.7m (41.7ft),  Out-to-Out Width: 13.0m (42.7ft)

Condition: Deck: Good,  Superstructure: Satisfactory,  Substructure: Fair,  Channel: Very good,  Operating Rating: 80.3 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF),  Inventory Rating: 37.1 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Somewhat better than minimum adequacy,  Deck Geometry: Better than present minimum criteria,  Waterway Adequacy: Equal to present desirable criteria,  Approach Roadway Alignment: Equal to present desirable criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: June 14,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Monolithic Concrete
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Structure Number: 262,  Location: MILE POINT 129.0 (Lat: 62.889422,  Lng: -149.764239),  Route carried "on" structure: Interstate A41,  Year Built: 1969,  Year Reconstructed: 2006,  Status: Open,  Structure Length: 8.17m (26.80ft),  Average Daily Traffic: 1,308 (year 2013),  Truck Traffic: 24%,  Average Future Daily Traffic: 1,600 (year 2032),  Design Load: HS 20,  Features Intersected: LITTLE COAL CREEK,  Facility Carried by Structure: PARKS HIGHWAY
Minimum Vertical Clearance: 5.41m (17.75ft),  Kilometerpoint: 207.561,  Lanes on structure: 2,  Base Highway Network: Yes,  Owner: State Highway Agency,  Approaching Roadway Width: 12.2m (40.0ft),  Material/Design: Steel,  Design/Construction: Arch - Deck,  Number Of Spans In Main Unit: 1,  Number Of Approach Spans: 8,  Length of Maximum Span: 44.2m (145.0ft),  Curb-To-Curb Width: 10.1m (33.1ft),  Out-to-Out Width: 10.4m (34.1ft)

Condition: Deck: Good,  Superstructure: Satisfactory,  Substructure: Satisfactory,  Channel: Very good,  Operating Rating: 74.5 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF),  Inventory Rating: 32.8 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Equal to present minimum criteria,  Deck Geometry: Somewhat better than minimum adequacy,  Waterway Adequacy: Superior to present desirable criteria,  Approach Roadway Alignment: Equal to present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Other Special Inspection Frequency: Every 24 months,  Inspection Date: June 14,  Other Special Inspection Date: June 12,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Monolithic Concrete
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Structure Number: 278,  Location: MILE POINT 34.7 (Lat: 61.761500,  Lng: -149.674725),  Route carried "on" structure: State highway 580,  Year Built: 1975,  Status: Open,  Structure Length: 3.35m (10.99ft),  Average Daily Traffic: 157 (year 2013),  Truck Traffic: 1%,  Average Future Daily Traffic: 250 (year 2032),  Design Load: HS 20,  Features Intersected: WILLOW CREEK,  Facility Carried by Structure: WILLOW/FISHHOOK RD
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 55.832,  Lanes on structure: 2,  Owner: State Highway Agency,  Approaching Roadway Width: 7.6m (24.9ft),  Skew: 4 degrees,  Material/Design: Prestressed concrete,  Design/Construction: Tee Beam,  Number Of Spans In Main Unit: 1,  Length of Maximum Span: 31.7m (104.0ft),  Curb-To-Curb Width: 7.3m (24.0ft),  Out-to-Out Width: 7.6m (24.9ft)

Condition: Deck: Good,  Superstructure: Good,  Substructure: Poor,  Channel: Very good,  Operating Rating: 50.9 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF),  Inventory Rating: 28.2 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Meets minimum limits,  Deck Geometry: Somewhat better than minimum adequacy,  Waterway Adequacy: Equal to present desirable criteria,  Approach Roadway Alignment: Equal to present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: June 14,  Deck Structure Type: Other,  Wearing Surface/Protective System: Wearing Surface: Monolithic Concrete
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Structure Number: 396,  Location: MILE POINT 30.4 (Lat: 61.763836,  Lng: -150.036667),  Route carried "on" structure: State highway 580,  Year Built: 1972,  Status: Open,  Structure Length: 2.26m (7.41ft),  Average Daily Traffic: 468 (year 2013),  Truck Traffic: 1%,  Average Future Daily Traffic: 800 (year 2032),  Design Load: HS 20+Mod,  Features Intersected: DECEPTION CREEK,  Facility Carried by Structure: WILLOW/FISHHOOK RD
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 48.853,  Lanes on structure: 2,  Owner: State Highway Agency,  Approaching Roadway Width: 10.4m (34.1ft),  Material/Design: Prestressed concrete,  Design/Construction: Box Beam or Girders - Multiple,  Number Of Spans In Main Unit: 2,  Length of Maximum Span: 11.0m (36.1ft),  Curb-To-Curb Width: 10.4m (34.1ft),  Out-to-Out Width: 11.3m (37.1ft)

Condition: Deck: Satisfactory,  Superstructure: Fair,  Substructure: Fair,  Channel: Satisfactory,  Operating Rating: 65.2 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF),  Inventory Rating: 30.2 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Somewhat better than minimum adequacy,  Deck Geometry: Equal to present minimum criteria,  Waterway Adequacy: Equal to present minimum criteria,  Approach Roadway Alignment: Equal to present desirable criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: June 14,  Deck Structure Type: Other,  Wearing Surface/Protective System: Wearing Surface: Bituminous
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Structure Number: 1782,  Location: MILE POINT 0.5 (Lat: 61.770503,  Lng: -149.956419),  Route carried "on" structure: County highway ,  Year Built: 2012,  Status: Open,  Structure Length: 4.18m (13.71ft),  Average Daily Traffic: 50 (year 2013),  Truck Traffic: 1%,  Average Future Daily Traffic: 65 (year 2032),  Features Intersected: WILLOW CREEK,  Facility Carried by Structure: W MICHELLE DRIVE
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 0.805,  Lanes on structure: 2,  Owner: County Highway Agency,  Approaching Roadway Width: 8.5m (27.9ft),  Material/Design: Prestressed concrete,  Design/Construction: Tee Beam,  Number Of Spans In Main Unit: 1,  Length of Maximum Span: 40.8m (133.9ft),  Curb-To-Curb Width: 8.5m (27.9ft),  Out-to-Out Width: 9.5m (31.2ft)

Condition: Deck: Very good,  Superstructure: Very good,  Substructure: Very good,  Channel: Very good,  Operating Rating: 87.7 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF),  Inventory Rating: 40.4 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Equal to present desirable criteria,  Deck Geometry: Better than present minimum criteria,  Waterway Adequacy: Equal to present desirable criteria,  Approach Roadway Alignment: Equal to present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: June 14,  Deck Structure Type: Other,  Wearing Surface/Protective System: Wearing Surface: Monolithic Concrete,  Deck Protection: Epoxy Coated Reinforcing
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Structure Number: 1923,  Location: MILE POINT 31.6 (Lat: 61.704731,  Lng: -150.002417),  Route carried "on" structure: Interstate A41,  Year Built: 2002,  Status: Open,  Structure Length: 14.00m (45.93ft),  Average Daily Traffic: 3,900 (year 2013),  Truck Traffic: 11%,  Average Future Daily Traffic: 7,000 (year 2032),  Design Load: HS 25,  Features Intersected: WHITES CROSSING,  Facility Carried by Structure: PARKS HIGHWAY
Minimum Vertical Clearance: 5.33m (17.49ft),  Kilometerpoint: 50.791,  Lanes on structure: 2,  Base Highway Network: Yes,  Owner: State Highway Agency,  Approaching Roadway Width: 12.2m (40.0ft),  Skew: 3 degrees,  Material/Design: Prestressed concrete,  Design/Construction: Tee Beam,  Number Of Spans In Main Unit: 4,  Length of Maximum Span: 44.5m (146.0ft),  Curb or Sidewalk Widths: Left: 0.0m,  Right: 3.7m (12.1ft),  Curb-To-Curb Width: 12.0m (39.4ft),  Out-to-Out Width: 16.8m (55.1ft)

Condition: Deck: Very good,  Superstructure: Very good,  Substructure: Very good,  Channel: Very good,  Inventory Rating: 47.4 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF),  Structural Evaluation: Equal to present desirable criteria,  Deck Geometry: Somewhat better than minimum adequacy,  Underclear: Equal to present desirable criteria,  Waterway Adequacy: Equal to present desirable criteria,  Approach Roadway Alignment: Equal to present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: June 14,  Deck Structure Type: Other,  Wearing Surface/Protective System: Wearing Surface: Monolithic Concrete,  Membrane: Preformed Fabric,  Deck Protection: Epoxy Coated Reinforcing
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