Alton, IL: 1911-2002 Alton Steel Inc (ASI)/Laclede Steel and Illinois Terminal Roundhouse

Steel Mill: (Satellite)

Roundhouse: (Satellite)

AltonSteel
"Alton Steel operates a 200 ton electric arc furnace and a 14″ bar mill. We have the capacity to melt 750,000 tons of steel in the melt shop a year and to roll 400,000 tons of steel bars in our 14″ rolling mill."

Six Miles of Local History Flickr, License: Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND) 
[I was going to crop out the lower half until I noticed the NoDerivs in the license.]

TheTelegraph
"Founded as Laclede Steel, the company was incorporated in 1911 with facilities in Alton and Vandalia, Illinois, as well as in Pennsylvania and West Virginia. The company went bankrupt in 2001 and emerged as Alton Steel Inc. in 2003." It became employee owned in 2019.

"ASI is a Special Bar Quality (SBQ) steel mill producing rounds, round-cornered squares, and bar-in-coil in the heartland of America. ASI was established is 2003 in Alton, Illinois, and is located 25 miles north of St. Louis." [AltonSteel_press_release]

TheTelegraph
The company started in Madison, IL, and moved to Alton in 1915.

 

DigitalHagley
Charging electric furnace, Laclede Steel Company (Alton, Ill.)

DigitalHagley
Charging electric furnace, Laclede Steel Company (Alton, Ill.) [I think the caption is wrong in this case because the lid is on the furnace.]

I copied this post from Kaiser Steel because of Tom's comment.

Jon Wolfe posted
Kaiser Steel
Daniel Neil Meyers: Continuous butt weld pipe mill? Looks like the same mill we had at WPSC until it closed in 1984
Blaine Chapman: Daniel Neil Meyers You’re exactly right Dan. There is one in Wheatland Pa. still in operation. 1/2” - 4” pipe. The torch is your biggest friend.
Tom White: CBWP 10 Stand Just Like Laclede Steel Plant In Alton IL

I got this aerial because it includes the entire Laclede mill.

EarthExplorer: Mar 17, 1968 @ 24,000; AR1VBZG00040070

But the roundhouse was gone, so I got this aerial.

EarthExplorer: Aug 2, 1945 @ 27,200; AR1BO0000020068

Roundhouse remnants:

Satellite

This is what taught me about the Illinois Terminal roundhouse.

1950 Alton Quad @ 24,000

The NYC and CB&Q evidently shared the tracks above the GM&O tracks. According to a USGS map, Norfolk Southern now owns the Illinois Terminal route.

1968 Alton Quad @ 24,000

Encyclopedia has a detailed history.