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Bridge Statistics for St. Ignace, Michigan (MI)
Condition, Traffic, Stress, Structural Evaluation, Project Costs


  • National Bridge Inventory (NBI) Statistics
  • 12Number of bridges
  • 102ft / 30.9mTotal length
  • 39,259Total average daily traffic
  • 3,024Total average daily truck traffic
  • National Bridge Inventory (NBI) Registered Bridges for St. Ignace
  • No street view available for this location

New bridges in St. Ignace, MI - historical statistics
  • New bridges - historical statistics
  • 11930-1939
  • 21950-1959
  • 91960-1969
Reconstructed bridges in St. Ignace, MI - Historical Statistics
  • Reconstructed bridges - Historical Statistics
  • 11990-1999
  • 02000-2009
  • 12010-2019
Average Bridge Daily Traffic in St. Ignace, MI
Bridge Condition - Deck
  • Bridge Condition - Deck
  • 33.3%Good
  • 50.0%Satisfactory
  • 16.7%Fair
Bridge Condition - Superstructure
  • Bridge Condition - Superstructure
  • 50.0%Good
  • 16.7%Satisfactory
  • 33.3%Fair
Bridge Condition - Substructure
  • Bridge Condition - Substructure
  • 16.7%Good
  • 50.0%Satisfactory
  • 16.7%Fair
  • 16.7%Poor
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Structure Number: 5948,  Location: IN ST IGNACE (CO RD 4914) (Lat: 45.877283,  Lng: -84.739311),  Route carried "on" structure: Interstate 75,  Year Built: 1960,  Status: Open,  Structure Length: 8.47m (27.79ft),  Average Daily Traffic: 2,555 (year 2007),  Truck Traffic: 8%,  Average Future Daily Traffic: 6,165 (year 2018),  Design Load: HS 20+Mod,  Features Intersected: CHEESEMAN RD & RR (ABN)
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 10.408,  Lanes on structure: 2,  Lanes under structure: 2,  Base Highway Network: Yes (Inventory Route: 114,  Subroute: 5),  Owner: State Highway Agency,  Approaching Roadway Width: 10.9m (35.8ft),  Skew: 13 degrees,  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 4,  Length of Maximum Span: 21.9m (71.9ft),  Curb-To-Curb Width: 10.3m (33.8ft),  Out-to-Out Width: 10.6m (34.8ft)

Condition: Deck: Fair,  Superstructure: Fair,  Substructure: Poor,  Operating Rating: 80.7 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading,  Inventory Rating: 48.3 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading,  Structural Evaluation: Meets minimum limits,  Deck Geometry: Meets minimum limits,  Underclear: Somewhat better than minimum adequacy,  Approach Roadway Alignment: Equal to present minimum criteria,  Designated Inspection Frequency: Every 12 months,  Inspection Date: May 2021,  Bridge Improvement Cost: $171,000,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Latex Concrete
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Structure Number: 5949,  Location: IN ST IGNACE I-75 (Lat: 45.857628,  Lng: -84.727950),  Route carried "on" structure: US 2,  Year Built: 1957,  Year Reconstructed: 1997,  Status: Open,  Structure Length: 5.88m (19.29ft),  Average Daily Traffic: 7,950 (year 2007),  Truck Traffic: 8%,  Average Future Daily Traffic: 11,023 (year 2018),  Design Load: HS 20,  Features Intersected: I-75
Minimum Vertical Clearance: 30.48m (100.00ft),  Kilometerpoint: 100.192,  Lanes on structure: 5,  Lanes under structure: 5,  Base Highway Network: Yes (Inventory Route: 114,  Subroute: 8),  Owner: State Highway Agency,  Approaching Roadway Width: 21.3m (69.9ft),  Skew: 22 degrees,  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 4,  Length of Maximum Span: 19.9m (65.3ft),  Curb-To-Curb Width: 23.5m (77.1ft),  Out-to-Out Width: 24.5m (80.4ft)

Condition: Deck: Good,  Superstructure: Fair,  Substructure: Fair,  Operating Rating: 74.2 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading,  Inventory Rating: 44.4 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading,  Structural Evaluation: Somewhat better than minimum adequacy,  Deck Geometry: Better than present minimum criteria,  Underclear: Meets minimum limits,  Approach Roadway Alignment: Better than present minimum criteria,  Designated Inspection Frequency: Every 12 months,  Inspection Date: August 2021,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Monolithic Concrete
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Structure Number: 595,  Location: IN ST IGNACE, PORTAGE ST (Lat: 45.866681,  Lng: -84.734539),  Route carried "on" structure: Interstate 75,  Year Built: 1960,  Status: Open,  Structure Length: 4.20m (13.78ft),  Average Daily Traffic: 2,555 (year 2007),  Truck Traffic: 8%,  Average Future Daily Traffic: 5,997 (year 2018),  Design Load: HS 20+Mod,  Features Intersected: PORTAGE ST
Minimum Vertical Clearance: 30.48m (100.00ft),  Kilometerpoint: 9.148,  Lanes on structure: 2,  Lanes under structure: 2,  Base Highway Network: Yes (Inventory Route: 114,  Subroute: 7),  Owner: State Highway Agency,  Approaching Roadway Width: 12.8m (42.0ft),  Skew: 10 degrees,  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 3,  Length of Maximum Span: 17.3m (56.8ft),  Curb-To-Curb Width: 12.8m (42.0ft),  Out-to-Out Width: 14.3m (46.9ft)

Condition: Deck: Satisfactory,  Superstructure: Good,  Substructure: Satisfactory,  Operating Rating: 61.6 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading,  Inventory Rating: 36.9 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading,  Structural Evaluation: Equal to present minimum criteria,  Deck Geometry: Equal to present desirable criteria,  Underclear: Better than present minimum criteria,  Approach Roadway Alignment: Better than present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: October 2020,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Latex Concrete
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Structure Number: 5951,  Location: IN ST IGNACE, PORTAGE ST (Lat: 45.866644,  Lng: -84.734864),  Route carried "on" structure: Interstate 75,  Year Built: 1960,  Status: Open,  Structure Length: 4.20m (13.78ft),  Average Daily Traffic: 2,555 (year 2007),  Truck Traffic: 8%,  Average Future Daily Traffic: 5,997 (year 2018),  Design Load: HS 20+Mod,  Features Intersected: PORTAGE ST
Minimum Vertical Clearance: 30.48m (100.00ft),  Kilometerpoint: 9.148,  Lanes on structure: 2,  Lanes under structure: 2,  Base Highway Network: Yes (Inventory Route: 114,  Subroute: 5),  Owner: State Highway Agency,  Approaching Roadway Width: 12.8m (42.0ft),  Skew: 10 degrees,  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 3,  Length of Maximum Span: 17.3m (56.8ft),  Curb-To-Curb Width: 12.8m (42.0ft),  Out-to-Out Width: 14.3m (46.9ft)

Condition: Deck: Satisfactory,  Superstructure: Good,  Substructure: Satisfactory,  Operating Rating: 61.6 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading,  Inventory Rating: 36.9 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading,  Structural Evaluation: Equal to present minimum criteria,  Deck Geometry: Equal to present desirable criteria,  Underclear: Better than present minimum criteria,  Approach Roadway Alignment: Better than present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: October 2020,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Latex Concrete
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Structure Number: 5952,  Location: @ N JCT I-75 BL (Lat: 45.907525,  Lng: -84.740025),  Route carried "on" structure: Business Interstate 75,  Year Built: 1960,  Year Reconstructed: 2015,  Status: Open,  Structure Length: 7.51m (24.64ft),  Average Daily Traffic: 4,350 (year 2015),  Truck Traffic: 3%,  Average Future Daily Traffic: 5,050 (year 2035),  Design Load: HS 20,  Features Intersected: I-75
Minimum Vertical Clearance: 30.48m (100.00ft),  Kilometerpoint: 107.595,  Lanes on structure: 2,  Lanes under structure: 4,  Base Highway Network: Yes (Inventory Route: 114,  Subroute: 8),  Owner: State Highway Agency,  Approaching Roadway Width: 11.0m (36.1ft),  Skew: 4 degrees,  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Number Of Spans In Main Unit: 4,  Length of Maximum Span: 23.7m (77.8ft),  Curb-To-Curb Width: 10.0m (32.8ft),  Out-to-Out Width: 11.2m (36.7ft)

Condition: Deck: Good,  Superstructure: Good,  Substructure: Good,  Operating Rating: 82.9 metric tons,  Method Used To Determine Operating Rating: Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading,  Inventory Rating: 49.9 metric tons,  Method Used To Determine Inventory Rating: Load Factor (LF) rating reported by rating factor (RF) method using MS18 loading,  Structural Evaluation: Better than present minimum criteria,  Deck Geometry: Meets minimum limits,  Underclear: Somewhat better than minimum adequacy,  Approach Roadway Alignment: Equal to present desirable criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: October 2020,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Latex Concrete
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Structure Number: 5984,  Location: 1 MI N B L 75 ON CTY RD 4 (Lat: 45.919853,  Lng: -84.734500),  Route carried "on" structure: County highway 4963,  Year Built: 1930,  Status: Open,  Structure Length: 0.64m (2.10ft),  Average Daily Traffic: 2,020 (year 2015),  Truck Traffic: 7%,  Average Future Daily Traffic: 2,300 (year 2035),  Features Intersected: RABBITS BACK CREEK,  Facility Carried by Structure: MACKINAC TRL. FH41
Minimum Vertical Clearance: 30.48m (100.00ft),  Kilometerpoint: 1.827,  Lanes on structure: 2,  Owner: County Highway Agency,  Approaching Roadway Width: 9.1m (29.9ft),  Skew: 4 degrees,  Material/Design: Concrete,  Design/Construction: Slab,  Number Of Spans In Main Unit: 1,  Length of Maximum Span: 6.4m (21.0ft),  Curb-To-Curb Width: 12.2m (40.0ft),  Out-to-Out Width: 12.6m (41.3ft)

Condition: Deck: Satisfactory,  Superstructure: Satisfactory,  Substructure: Satisfactory,  Channel: Good,  Operating Rating: 32.7 metric tons,  Method Used To Determine Operating Rating: Field evaluation and documented engineering judgment,  Inventory Rating: 32.7 metric tons,  Method Used To Determine Inventory Rating: Field evaluation and documented engineering judgment,  Structural Evaluation: Equal to present minimum criteria,  Deck Geometry: Equal to present minimum criteria,  Waterway Adequacy: Equal to present minimum criteria,  Approach Roadway Alignment: Better than present minimum criteria,  Designated Inspection Frequency: Every 24 months,  Inspection Date: October 2021,  Deck Structure Type: Concrete Cast-file-Place,  Wearing Surface/Protective System: Wearing Surface: Bituminous
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Structure Number: 5947,  Location: IN ST IGNACE (Lat: 45.877156,  Lng: -84.738889),  Route carried "under" structure: County highway 4914,  Year Built: 1960,  Structure Length: 0. m,  Average Daily Traffic: 149 (year 1992),  Truck Traffic: 10%,  Features Intersected: CHEESEMAN RD & RR (ABN),  Facility Carried by Structure: I-75 NB
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 8.271,  Lanes on structure: 2,  Lanes under structure: 2,  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Length of Maximum Span: 21.9m (71.9ft)

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Structure Number: 5948,  Location: IN ST IGNACE (CO RD 4914) (Lat: 45.877283,  Lng: -84.739311),  Route carried "under" structure: County highway 4914,  Year Built: 1960,  Structure Length: 0. m,  Average Daily Traffic: 149 (year 1992),  Truck Traffic: 10%,  Features Intersected: CHEESEMAN RD & RR (ABN),  Facility Carried by Structure: I-75 SB
Minimum Vertical Clearance: 30+ m (98+ ft),  Kilometerpoint: 8.243,  Lanes on structure: 2,  Lanes under structure: 2,  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Length of Maximum Span: 21.9m (71.9ft)

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Structure Number: 5949,  Location: IN ST IGNACE I-75 (Lat: 45.857628,  Lng: -84.727950),  Route carried "under" structure: Interstate 75,  Year Built: 1957,  Structure Length: 0. m,  Average Daily Traffic: 11,076 (year 2007),  Truck Traffic: 9%,  Features Intersected: I-75
Minimum Vertical Clearance: 4.88m (16.01ft),  Kilometerpoint: 8.008,  Lanes on structure: 5,  Lanes under structure: 5,  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Length of Maximum Span: 19.9m (65.3ft)

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Structure Number: 595,  Location: IN ST IGNACE, PORTAGE ST (Lat: 45.866681,  Lng: -84.734539),  Route carried "under" structure: City street ,  Year Built: 1960,  Structure Length: 0. m,  Average Daily Traffic: 289 (year 1986),  Truck Traffic: 10%,  Features Intersected: PORTAGE ST,  Facility Carried by Structure: I-75 NB
Minimum Vertical Clearance: 4.88m (16.01ft),  Kilometerpoint: 2.625,  Lanes on structure: 2,  Lanes under structure: 2,  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Length of Maximum Span: 17.3m (56.8ft)

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Structure Number: 5951,  Location: IN ST IGNACE, PORTAGE ST (Lat: 45.866644,  Lng: -84.734864),  Route carried "under" structure: City street ,  Year Built: 1960,  Structure Length: 0. m,  Average Daily Traffic: 289 (year 1986),  Truck Traffic: 10%,  Features Intersected: PORTAGE ST,  Facility Carried by Structure: I-75 SB
Minimum Vertical Clearance: 4.88m (16.01ft),  Kilometerpoint: 2.599,  Lanes on structure: 2,  Lanes under structure: 2,  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Length of Maximum Span: 17.3m (56.8ft)

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Structure Number: 5952,  Location: @ N JCT I-75 BL (Lat: 45.907525,  Lng: -84.740025),  Route carried "under" structure: Interstate 75,  Year Built: 1960,  Structure Length: 0. m,  Average Daily Traffic: 5,322 (year 2007),  Truck Traffic: 8%,  Features Intersected: I-75
Minimum Vertical Clearance: 5.26m (17.26ft),  Kilometerpoint: 13.979,  Lanes on structure: 2,  Lanes under structure: 4,  Material/Design: Steel,  Design/Construction: Stringer/Multi-beam,  Length of Maximum Span: 23.7m (77.8ft)

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