Saturday, May 2, 2026

Flat Rock Dam on Schuylkill River and Manayunk Canal Lock #68 at Philadelphia, PA

Dam: (Satellite)
Lock: (Satellite)

This view looks over the canal at the diversion dam on the right.
Street View, Jun 2016

The concrete wall is part of the lock.
Lester Wiggs, Sep 2018

Michael E Pearson added
Flat Rock Dam, a graffiti covered canal lock, and fresh pavement that'll probably be a continuation of Flat Rock Road when whatever new developments are complete

This has more graffiti than a boxcar.
Bellina, Jul 2017

A lot more.
Douglas Smithman, Jun 2020

We can see the Wasta Weir in the above photo.
Nicholas Grbec, Mar 20216

Douglas Smithman, Jun 2020

This would have operated the gates in the Historic Gate House.
Raz Reed, Aug 2017

This satellite image caught them still building the new channel and its control structure.
Satellite

Anderson Tunnel near Whittier, AK, longest highway tunnel in North America

(Satellite

This tunnel is the only land access to Whittier, AK.

It is a railroad tunnel that allows one lane of traffic when a train is not scheduled. The vehicle traffic alternates direction every half hour. The fans have to be reversed when the traffic flow is reversed.

The tunnel is 4km (2.5 miles) long. [tommorow.city]

Street View, Oct 2021

Because the tunnel changes direction every half hour, it has parking at the entrance to queue up the cars waiting to go the other direction. The tunnel closes at 11pm so if you are not careful, you can get stuck in Whitter overnight.
Street View, Aug 2009

Facebook Reel
[A comment observed that you could tell that she was a city girl because she locked her van.]

There used to be railcar ferries, but they don't look like they are active anymore.
Satellite

Friday, May 1, 2026

1906 28.5mw Minidoka Dam on Snake River for Irrigation

(Satellite)

Minidoka Dam is a storage and diversion dam for two different irrigation canals.
These would be the gates for the Gravity Canal that is on the south side of the dam. In April, they are opening the gates to start the irrigation season.
Facebook Reel

Same Reel

Same Reel
Three pump houses pump the water up 30' (9m) for a total of 90' (27m).

Photo via uidaho"Minidoka Dam and Reservoir near Rupert", Archival Idaho Photograph Collection, University of Idaho Library Digital Collections, Public Domain

nps
"Today, the multi-faceted Minidoka Project, which provides irrigation water to more than one million acres, counts a total of seven dams and thousands of miles of canals, laterals and drains. Still at the core is the more than 100-year-old Minidoka Dam, significant as the Bureau of Reclamation’s first embankment dam and the first Federally-built dam in the Pacific Northwest to include a powerplant to supply electricity. Minidoka Dam stands only 86 feet [26m] high, but its spillway, designed to handle the great flow of the Snake River, is made of concrete and stretches 2,300 feet [701m] long, or nearly one-half of a mile."
"Over the years, Minidoka Dam has undergone additions and repairs, including the current reconstruction of its spillway. A sixth generating unit was installed in the powerplant in 1927, and a seventh in 1942. Then, in the early 1990s, work began on a new powerplant, with Units 8 and 9 added in 1997. Reclamation retired the original five generators from service but preserved them as museum pieces in the original powerhouse building, where visitors still can see them."

usbr
"The combined generation capacity of all four units is 28.5 megawatts, with a combined flow of 8670 cubic feet per second."
In 2015, the new $21.3m spillway with radial gates replaced the original spillway that used stop logs.

1962+1923 Independence Bridge over Honey Creek in Pike County, IL

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

The land between the Mississippi and Illinois Rivers is a bit of a wilderness. The nearest town, Pittsfield, is not close. There are no more bridges across the Illinois River south of IL-106, which goes through Pittsfield. In fact, Google Maps can't even find Independence, IL. But a USGS map could.

Lisa Ruble posted five images with the comment:
Honey Creek bridge east of Independence 
Replaced in 2013 
The last group of four pictures were taken in 2005.
Pike County
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3

4

5

The oldest available street view was taken after the bridge was replaced.
Street View, Aug 2016

Thursday, April 30, 2026

Spellacy Covered Bridge and Pleasant Hill Dam Clear Fork Mohican River near Loudonville, OH

Bridge: (Satellite)
Dam: (Satellite)

Wally Road Scenic Byway posted five photos with the comment:
A little history about the name of our beautiful Spellacy Covered Bridge 
Spellacy Bridge
The mystery of the name Spellacy had hopes of being a romantic story of a long gone family that lived in the area. A story filled with blood, sweat and tears soaking the soil in the efforts to keep the family and farm thriving.  A story that would lead us to generations of family members that broke ground, fell trees and became a vital part of the areas history. 
But in actuality…….the name arrived in the form of Matthew Spellacy, a railroad contractor, born in 1843 in Ireland who got the contract for that section of the railroad track. 
According to his obituary, Mr Spellacy, who died in  September 1912 at 67 years of age, was a well-known contractor, director and large stockholder of the Driving Park Association, died at his home in Alton Ohio. During his life in Franklin County he managed some of the most important contracting work in the country.  He built the Norfolk and Western, worked for the Pennsylvania Railroad and built the Toledo and Ohio Central Belt Line.  He accumulated much wealth and gave generously to many charities and to individuals among the poor.
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5

Luke O'Neal, Oct 2018

This shows the outlet control works on the right and the morning glory spillway in the right foreground.
Street View, Jul 2024

I hope the morning glory spillway is big enough because I could not find an emergency spillway for this earthen dam.
Satellite

Wild Marks, Aug 2023

Allegheny Portage Railroad Engine House #6 for an Incline

(Satellite)

A nearby skewed arch bridge went over the Allegheny Portage Railroad.

Jenn Gray, Oct 2023

Kirk (kirkevonphilly), Sep 2025

Sam L, Aug 2024

CJ Q, Oct 2025

Kevin Horst, Oct 2024

Gregory Wood, Mar 2020

Joshua Warzel, Sep 2022

Joshua Warzel, Sep 2022

There is a large visitor center nearby.
lindsta, Sep 2025

Facebook Reel


Wednesday, April 29, 2026

1930 Cotter and 1905 MNA/MoPac/SIMS Bridges over White River at Cotter, AR

Cotter: (Archived Bridge Hunter; Bridge Hunter; Historic Bridges; HAERSatellite)

MNA = Missouri & Northern Arkansas
SIMS = St. Louis, Iron Mountain & Southern

Street View, Jul 2023

Bridges Now and Then posted
Cotter Bridge, Flippin, Arkansas. (Historic American Engineering Record, Library of Congress, Prints and Photographs Division, Washington, D.C.)
HAER ARK,3-COT,1--5
5. VIEW OF CENTER SPAN OF BRIDGE FROM RIVERBED, LOOKING SOUTHWEST - Cotter Bridge, Spanning White River at U.S. Highway 62, Cotter, Baxter County, AR

"Significance: The Cotter Bridge is the only bridge in Arkansas known to be designed and engineered by the Marsh Engineering Company, a significant twentieth-century bridge-building company. Among the largest they ever designed, it is also an excellent example of the company's patented Marsh Rainbow Arch. A unique feature of the bridge is that it was constructed by means of a cableway, suspended across the river, over which all materials were transported to various parts ofthe structure. The Cotter Bridge was instrumental in making accessible a new region of the Ozarks, an important recreational area in the United States. It became Arkansas' first National Civil Engineering Landmark in 1986." [HAER_data, at the end of that webpage are some blueprints for this bridge]

Fredrick Garcia via BridgeHunter_Cotter

Street View, Jul 2023

HAER ARK,3-COT,1--4
4. LOOKING NORTHEAST, GENERAL VIEW OF BRIDGE

HAER ARK,3-COT,1--10
10. VIEW OF BRIDGE UNDER CONSTRUCTION, SHOWING CENTRAL ARCH AND PIERS, WITH CABLEWAY ABOVE AND TOWER ON BACKGROUND

HistoricBridges_Cotter
"While the nearby state of Kansas may have the greatest quantity of surviving Marsh type rainbow arch bridges in the country, it is this single surviving example in Arkansas that is ironically also the greatest Marsh arch bridge. This bridge's impressive height over the waterway, enormous arch spans over the river (complimented by a single small arch span over railroad tracks), and the overall multi-span layout of this bridge that all combine to form what is the most impressive and historically significant Marsh rainbow arch bridge in the entire country. In a very real sense this bridge also represents the ultimate aesthetic potential of concrete in bridge construction. From every angle that this bridge is viewed it projects a profound beauty that is unmatched in more simple concrete bridge forms.
"Beautifully preserved, this bridge remains in good condition today. Repairs and replacements made, such as railing and lighting, are respective of the original bridge design."
[This is one of the few bridges that HistoricBridges rates with two 10s.]

MoPac Swing Bridge


The swing span is now over an island! I wonder how much further upstream steamboats used to travel on this river.
Street View, Jun 2014

Back when the channel was under the swing span.

Photo by Fredrick Garcia via BridgeHunter_MoPac

Photo by Nicky Elmore via BridgeHunter_MoPac

HistoricBridges_MoPac
"This bridge is unusual because it is fairly high above normal water level for a swing bridge. Most boats would be able to fit under this bridge. Today, the bridge is even more unusual because with trees growing under one of the swing span arms, and shallow water under the other, it is clear this river has not been navigable for large boats for a very long time!"