1950 US-1 Maurice J. Tobin Bridge over Mystic River at Boston, MA

Tobin: (Archived Bridge Hunter; Bridge Hunter; Historic Bridges; Satellite)

Channel bridge a little further south: (Satellite)

The 1,524' (465m) cantilever part has a 901' (244m) main span. [HistoricBridges]

The entire bridge is 9,418' (2871m) long. [Description in ArchivedBridgeHunter]

The truss span over the Little Mystic Channel is 439' (134m) long. [HistoricBridges]

The clearance of the cantilever span is 135' (41m), and the truss span has a clearance of 100' (30.5m). "The bridge is the largest in New England." [wfrjr]

Boat View, Sep 2017

Rand Peck posted two photos with the comment:

8/29/22: Officially the Maurice J. Tobin Memorial Bridge, most know it simply as the Mystic River Bridge that connects Boston to Chelsea, Massachusetts. Built between 1948 to 1950 it’s New England’s longest bridge at 11,906 long, 36’ wide with three lanes on two levels.

We’re looking north here from Boston Inner Harbor.

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2012 Photo by Zachery via ArchivedBridgeHunter

Why do the northbound and southbound lanes have different heights?

Because it is a double-deck bridge. [HistoricBridges]

"The bridge provides three travel lanes northbound on its lower level and three lanes southbound on the upper level." [wfrjr]

On the Chelsea (north) side, there are local lanes as well as through lanes.

Street View, Sep 2022

The following two photos are zoom photos from the McArdle Bridge.

2020 Photo by Nick Boppel via BridgeHunter

2020 Photo by Nick Boppel via BridgeHunter
Little Mystic Channel truss span

Did they build across the navigation channel from the far pier to the temporary pier with no intervening falsework? A span with no live load may be strong enough for that. Normally, cantilever bridges are built from both ends and meet in the middle to avoid falsework in the navigation channel.

We see the predecessor swing bridge that used to open 7,000 times per year. [BostonRoads]

pdf via HistoricBridges

Dirty Old Boston posted

Carol Donahue: My four children were on the bridge when it collapsed. They had to stay on the bridge until all the cars behind them turned around back to Chelsea in order to get off. The driver in the truck that caused the accident was killed.

Tobin Bridge collapse, 1973. Note the Tonka Toy below.

Kathleen Manganelli: I called the police on this one. THe crash woke me up!

One of the problems with AI is that nothing has any attribution. In particular, what was the source of the renaming information?

Google Search Results

1845-1899 Old Beauharnois Canal and Aqueduct

Western Remnant: (Satellite)

(Aqueduct)

A Street View from the western (upstream) end:

Street View, Jul 2020

stlawrencepiks
The Old Beauharnois Canal was completed in 1845. The Soulanges Canal opened in 1899. The Beauharnois Power Canal opened in 1932. The two locks at the end of the power canal were added by 1959 as part of the St. Lawrence Seaway project. The Soulanges Canal was closed when the Seaway opened because those two locks could do the work of the five locks on the old canal.

Dom Lemyre posted 11 photos with the comment:

AQUEDUC OF THE RIVER-SAINT-PIERRE 1842-43

•Remnant of the old Beauharnois Canal

•The only remains of the old canal still intact

•Allowed farmers and cattle to pass through both sides of the canal

•the old Beauharnois Canal passed over it

Dom Lemyre shared

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We can tell from the walkway that this photo is looking in the opposite direction of the first two photos.

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Dom commented on his sixth photo
This tunnel is about on the red spot.

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1923,1994,2016 Warren Road Bridge over Lock Raven Reservoir on Gunpowder River near Baltimore, MD

(Archived Bridge Hunter; Bridge Hunter; Historic Bridges; Satellite)

The bridge is 640' (195m) long with three spans of 213' (65m). [BridgeHunter]

 

Street View, Jul 2024

Jerry Harris, Aug 2017

Michael Swygert posted
Another shot of the Warren Road Bridge over Loch Raven

Mark Jensen commented on Michael's post
Building Warren Rd bridge

Marla Gale commented on Michael's post
I took this one quite a few years ago.

Leo Stafsnes commented on Michael's post
I love this bridge, I’ve done multiple oil paintings of it, along with the one on paper mill road that’s now abandoned.

Leo Stafsnes commented on her comment

Joseph Rawlings commented on Michael's post

1903 Aban/WM Spring Garden Bridge

(Archived Bridge Hunter; Bridge Hunter; no Historic Bridges; Satellite)

WM = Western Maryland

"Swing span currently locked in open position. Proposal has been made to semi-permanently close this draw span (which sits over heavily silted, now-non-navigable waterway) and incorporate it into local waterfront trail system." [ArchivedBridgeHunter]

Street View, Aug 2023

I captured this view as well because I was surprised that a big sanbar disappeared during a couple of years.

Street View, May 2021

Most of the bridge is still a wood trestle.

Street View, Nov 2020

Dave Galp posted three photos with the comment:

Being in the passenger seat of a tractor trailer for once allowed me to take these pictures of which I normally wouldn't be able to get them. 

Photos taken from I95 Northbound looking east over a mainly abandoned yard before Washington Blvd and the abandoned swing bridge over the Patapsco River. 

Baltimore MD

Tim Shanahan shared

Jim Kelling: Western Maryland Railway Spring Garden bridge, no longer in use, which led to the Port Covington docks.

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Anthony Vo: The old Mt Clare freight yard

[location, this was before he got to the swing bridge.]

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Photo via ArchivedBridgeHunter
Looking west from east end

I've never noticed WM on maps of Baltimore, so I went back to basics to see where it entered the city.

wmwestsub via Dennis DeBruler

Given that it came in from the northwest and Jim's comment about going to Port Covington Yard, I was able to find the WM route through town.

1953/53 Baltimore East and West Quads @ 24,000

Port Covington no longer has any freight business.

Satellite

Hennepin Canal Lock #32

(Satellite)

Hennepin Canal Overview

John Vize posted two photos with the comment: "Lock # 32 at the Mississippi, October 1920, original from my personal collection."

Lloyd Scott Hardin shared

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Gay Street Bridges over Tennessee River in Knoxville, TN

1873: (Archived Bridge Hunter)

1880: (Archived Bridge Hunter) Called the Saulpaw Bridge because it was built by GW Saulpaw.

1897,2005-2024: (Archived Bridge Hunter; Historic Bridges; Satellite) 

The bridge failed its Jun 24, 2024, bridge inspection. They are now working on repairing it well enough to be a pedestrian bridge.

Street View, Jan 2025

Wikimedia
The old Gay Street Bridge, or "Saulpaw" bridge, as it appeared on an 1886 map of Knoxville, Tennessee, USA. This bridge was a wooden Howe truss bridge, built by G. W. Saulpaw in 1880. It was replaced by the current Gay Street Bridge in 1898. Cropped from map entitled, "Knoxville, Tennessee, County Seat of Knox County."

Faylor Holland posted

Tennessee River, Knoxville, Tennessee, before 1897...

Caption

Lucile Bordon, before 1897, on the Tennessee River at wharf at Knoxville.  Paddle wheel boat.  Shows old Gay Street Bridge.  The boat could go up to Sevierville when water was high from flooding...

Source

Knox County Two Centuries Photograph Project

Lloyd Scott Hardin shared

KnoxvilleHistoryProject
"The third bridge, often known as the County Bridge, that stood from 1881 to 1898. (McClung Historical Collection.)"

2008 Photo taken by Calvin Sneed via ArchivedBridgeHunter
"Knoxville's Oldest Bridge, a Spandrel-braced (cantilever) arch bridge built in 1897. View looking southbound."

KnoxvilleTN
A copy of the original Gay Street Bridge design by C.E. Fowler

HistoricBridges
The 1,512' (461m) long bridge has a main span of 252' (77m).

KnoxvilleHistoryProject, 2023 by Shawn Poynter

KnoxvilleTN
After an inspection found a booboo, the bridge was closed on Jun 25, 2024.
Sep 17, 2024: $850,000 was approved by the city council to fund an engineering study concerning the repair of the bridge.
Feb 12, 2025:

• City announces plan to ask City Council for $2 million to repair and reopen the Gay Street Bridge to pedestrians and cyclists.

• Additional load rating analysis announced in hopes the bridge can also be opened to limited emergency and Knoxville Area Transit vehicles.

• Estimated repair completion-early 2026.