1934 Lock and Dam #2 on Allegheny River at Pittsburgh, PA

(Satellite)

There no longer is a L&D #1 on the Allegheny River.

The lock is 56' (17m) x 360' (108m). The dam lenght is 1473' (450m) with an uncontrolled spillway of 1393 (425m)'. Supposedly, it has a hydraulic height of 58' (18m), but it sure doesn't look that high. [gainesville and data.telegram]

USACE, Pittsburgh District posted two photos with the comment:

On this day [Oct 25] in 1934, Allegheny Lock and Dam No. 2 began its operations! Located on the Allegheny River in Pennsylvania, this crucial infrastructure was built to manage the flow of water and facilitate river navigation. 🚢 For nearly 90 years, it has stood as a testament to engineering prowess, playing a pivotal role in supporting commerce, recreation, and regional development. Today, we commemorate its enduring legacy and importance to our community. Learn more about the mission of the U.S. Army Corps of Engineers Pittsburgh District at https://www.lrp.usace.army.mil/

1

2
[The road bridge is the Highland Park Bridge.]

USACE

Joseph Flickr, License: Creative Commons Attribution-NonCommercial-ShareAlike (CC BY-NC-SA)
Allegheny River Lock and Dam No. 2
This lock on the Allegheny between Pittsburgh's Highland Park neighborhood and Sharpsburg is the last before the river's confluence with the Monongahela to form the Ohio. This is one of the first barges I have seen on the Allegheny, although I believe there is still a steel mill located somewhere further upriver.

triblive
The USACE cut the boating season short in 2019 for a $6.6m project to fix the concrete on the land wall.
"The 87-year-old lock at mile 6.7 on the Allegheny River is the busiest lock for recreational boaters in the Pittsburgh area. It receives an average of 3,000 recreational lockages annually, according to the Corps. It also receives about 1,000 commercial vessels annually, the Corps said."

HistoricPittsburgh, PSS 23_B015_F05_I01, USACE, Public Domain, cropped
"Allegheny River Lock 2"   Date: Dec 9, 1912
[This must be the predecessor L&D #2 that was built between 1902-1908 at river mile 7.0. [USACE]]

HistoricPittsburgh, PSS 23_B052_F33_I01, USACE, Public Domain, cropped

USACE_NAVIGATION specifies the lock hours as "4 a.m. - 12 a.m." But that does not make sense to me. It is a good thing THAT I'm not a boater.