Steel Dam on Rock River and Hennepin Canal Lock #30

Dam: (Satellite)

Lock: (Satellite)

Flood Gate: (Satellite)

John Vize posted two photos with the comment: "The Steel Dam on the Rock River, lock # 30 Milan, Illinois under construction circa:1893 and now. This dam was replaced when it was about 100 years old. This provides water depth between lock 29 and 30 on the Rock River section where I live."

Brian QC: Now I miss my fishing back home lol

Lloyd Scott Hardin shared

Dennis DeBruler: Location: https://maps.app.goo.gl/fbqVJEZBG2yKvC6n7

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John Vize commented on his post, cropped

Bob Nolen: John Vize This is the actual "Steel Dam" which is only a flood gate. The COE used to open it during floods up until the federal government gave the canal to the state. Another piece of puzzle causing flooding for everyone upstream.

John Vize: Bob Nolen The dam never increased flooding when it was first built. The Mississippi can and does back up all the way over it. You are right about man messing things up. Sea walls everywhere like Rock Island, Milan, Big Island etc. etc. etc.

David Burrell, Sep 2020

clinton boyce, Apr 2022

John Vize posted four photos with the comment: "Then and now on the Hennepin Canal at lock #30, Milan, Illinois."

Lloyd Scott Hardin shared

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27th Street Bridges over Rock River and Hennepin Canal in Moline, IL

(Bridge Hunter broke Mar 22, 2023; Satellite)

Hennepin Canal Overview

Retro Quad Cities posted
Built in 1904 and replaced in 1938, this is the Moline Rock River bridge (27th Street)

I wonder what the 1938 bridge looked like. I doubt that the current bridge was built in 1938.

Street View, Aug 2019

A comment on the above post by Miles W. Rich explained that the 1904 bridge was high enough to clear barge traffic, but the 1938 bridge had a movable span. There was barge traffic until 1951 because this segment of the river was part of the Hennepin Canal. Specifically, the river was used between Steel Dam and Lock #30 on the west side and Lock #29 on the east side.

Satellite

1856+1906 ?/DL&W Nay Aug Tunnel in Scranton, PA

Western Portal: (Satellite)

Eastern Portal: (Satellite)

I don't know who owns this railroad route today.

Metrotrails posted two photos with the comment:

Then and Now Series: Nay Aug Tunnel seen from a viewing area on Davis Tr

ail, Nay Aug Park in Scranton PA, on our hike, compared to the mid 1900s construction photo at the site, photographer unknown (if you know, please help us to give credit).

The original tunnel was constructed in 1856, and the second, with concrete facing, was added in 1906. The historic photo shows bridge construction at the west portal of the tunnel, over Roaring Brook, likely following the Flood of 1955.

Metrotrails shared

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Part of a then and now compilation found here: https://www.facebook.com/metrotrails/posts/1423337651036102

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LC-D4-11624, D4-11625 [P&P], c1900

TripAdvisor
"Steamtown train entering Nay Aug tunnel "

The route was the DL&W.

1947/57 Scranton Quad @ 24,000

Lost/Nickel and 1921,2000 Million Dollar Bridges in Fairmont, WV

Nickel: (Archived Bridge Hunter; Bridge Hunter; no Historic Bridges; Satellite, the piers are extant.) "Nickel" was the name because the toll was a nickel.

Million Dollar: (Archived Bridge Hunter; Bridge Hunter; no Historic Bridges; Satellite) Also named Robert H. Mollohan and Jefferson Street

Thomas S Miller posted
Passenger station. “Million Dollar Bridge “ in the background. Nickel bridge on the left.

 

Given the tie-bar diagonal members, I presume this was a pin-connected truss.

looking west, wvhistoryonview via ArchivedBridgeHunter_nickel

 

Thomas S Miller posted
[The building by the river was the B&O Depot.]

The Million Dollar Bridge is 1248' (380m) with a span length of 279' (85m). [BridgeHunter]

Street View, Jul 2021

1892,1972,2007 CSX/Pennsy/Philadelphia, Baltimore & Washington over Anacostia River in Washington, DC and Control Tower

Bridge: (BridgeHunter; no Historic Bridges; Satellite)

Tower: (Satellite?)

Boat View, Sep 2014

Boat View, Sep 2014

W Brown, Mar 2017

Tim Evanson via BridgeHunter

Darren Reynolds posted

Conrails ( Ex-PRR) 

"Anacostia" tower 

Washington DC 

This tower is at the Junction of the CSX Capital Sub. 

It's still there as a bridge tenders Office for the Local Lift bridge ( Mostly in the summer)

Photo by: Brad Taylor  2002

Tim Shanahan shared

Richard Maguire commented on Darren's post
Here is a photo of the tower I shot from the train, during one of my many trips from Potomac Yard. This was during the Chessie System era and prior to CSX. I am not sure of the exact date.

The fence messed up the autofocus, but there appears to be a second story roof on the right side of this view. That is the location I selected for the satellite link at the top. However, that location is on the north side of the tracks. However, the bridge and yard tracks in Richard's photo implies the tower was on the south side of the tracks. But the only thing I saw there was the Benning Yard Office, which clearly looks different.

Bike View, Jun 2023

1909,2003 Shelby Street and 2004 Gateway Bridges over Cumberland River in Nashville, TN

1909: (Archived Bridge Hunter; Bridge Hunter; Historic Bridges; HAER; Satellite) 

2004: (Archived Bridge Hunter; Bridge Hunter; no Historic Bridges; Satellite)

I presume the name of the Shelby Street Bridge was changed to the John Seigenthaler Pedestrian Bridge in 2003 when it was rehabbed as a pedestrian bridge.

The 1,777' (572m) long Shelby Street Bridge has a main span of 318' (97m). [HistoricBridges]

The 1,600' (488m) long Gateway Bridge has a main span of 545' (116m).

Shelby Street Bridge

Street View, Jun 2009

Gateway Bridge

Street View, Jun 2018

 

HAER TENN,19-NASH,22--1
1. February 1998 AERIAL VIEW OF SOUTH SIDE OF BRIDGE: RIVER SPANS AND APPROACHES. LOOKING NORTH. - Sparkman Street Bridge, Spanning Cumberland River, Nashville, Davidson County, TN

"Significance: The bridge possesses state level engineering significance as an example of the through Parker and camelback truss types and for its uncommon concrete trusses. The bridge possesses local significance as a historic river crossing connecting downtown Nashville with East Nashville." [HAER_data]

2016 photo by Ben Tate, cropped, via BridgeHunter_2004

1909 is getting rather late for pin-connected construction. It is nice that an historic truss was preserved.

Brenden McCormack, Feb 2019

Alex Hamrick, May 2020

Janey Anderson posted

Well, I wasn't sure it would happen BUT I did find something appropriate to post for you Ship Junkies in Nashville today!  Tug Carolyn Lamprey (built 2019 by Bourg Drydock) and her barge came pushing along the Cumberland river with a full load, just when I was on top of the John Seigenthaler pedestrian bridge taking in the sights.

*Tug Carolyn Lampley, is named for the sister of the late Ron Hunter, who founded and was president of Hunter Marine Transport—a barge and towing company with more than a dozen towboats—that Kent Furlong bought in 2018. Hunter died in 2017 after a 40-year career, the capstones of which were building the barge line as well as developing a bulk terminal operation and a sand and gravel dredging enterprise.

That's all I got!! 

Sept. 23, 2024

HistoricBridges explains that the concrete trusses on the west side had to be replaced after just a few years because the defective concrete started spalling. But I see they lasted on the east side. This is why the label "bridgeArch" was added to these notes.

Street View, Jan 2025

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?

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