| Special Bridge Conditions Legend |
| ! | Confirmed demolition date within one year or an especially historic bridge that is threatened with demolition at any level. |
| X | The bridge has been confirmed demolished or collapsed. |
| S | The bridge has been dismantled or moved to an offsite location and is not currently available for public viewing. |
| L | Most or all of the original bridge material has been demolished and replaced, including historically significant elements, but some original parts of the bridge remain. |
| Note: This website cannot guarantee the current condition of any bridge on this website. Bridges lacking these icons should not necessarily be considered condition-free. |
| Bridge Name | HSR Rating | Facility Carried / Feature Intersected | Location | Structure Type | Structure Dimensions | Construction Date / Builder or Contractor | Description | Thumbnail |
Aiken Street Bridge
Ouellette Bridge |
 | Aiken Street Over Merrimack River | Lowell: Middlesex County, Massachusetts | Metal 11 Panel Pin-Connected Lenticular Through Truss, Fixed |
Total Length: 780 ft Main Span Length: 155 ft Roadway Width: 29 ft Main Spans: 5 |
1883 By: Berlin Iron Bridge Company of East Berlin, Connecticut | This incredible bridge is the longest lenticular truss bridge in the country, and the one with the most spans. | 
|
Bridge Street Bridge
|
 | Bridge Street Over Merrimack River | Lowell: Middlesex County, Massachusetts | Metal Cantilever 10 Panel Rivet-Connected Warren Through Truss, Fixed |
Total Length: 474 ft Main Span Length: 197 ft Roadway Width: 40 ft Main Spans: 3 |
1937 By: American Bridge Company of New York, New York | A rare example of a small-scale cantilever bridge structure. | 
|
Lowell Canal Bridge
|
 | Pedestrian Walkway Over Canal | Lowell: Middlesex County, Massachusetts | Metal 6 Panel Rivet-Connected Warren Pony Truss, Fixed | Main Spans: 1 | By: Unknown | A small, lightweight pony truss that likely was originally built for the use of area mills and industry. | 
| ! |
University Avenue Bridge
Jack Kerouac Textile Memorial Bridge |
 | University Avenue Over Merrimack River | Lowell: Middlesex County, Massachusetts | Metal 12 Panel Pin-Connected Pratt Deck Truss, Fixed |
Total Length: 486 ft Main Span Length: 180 ft Roadway Width: 36.7 ft Main Spans: 3 |
1895 By: Unknown | A rare pin-connected deck truss located serves a university yet is slated for demolition. | 
|
Walker Street Bridge
|
 | Walker Street Over Railroad (Boston and Maine) | Lowell: Middlesex County, Massachusetts | Metal 5 Panel Rivet-Connected Pratt Full-Slope Pony Truss, Fixed |
Total Length: 64 ft Main Span Length: 57 ft Roadway Width: 23 ft Main Spans: 1 |
1910 By: Boston Bridge Works of Boston, Massachusetts | A short pony truss provides an attractive railroad grade separation. | 
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