3.11 miles; from Route 10 to Route 322 in Southington.

In the 1920s, State Highway 120 followed today's Route 63 between Naugatuck and New Haven.

The modern Route 120 was commissioned in 1932 from the 1920s SH 326; no changes since then.

• Route 120 Ends (Photos; Doug Kerr at state-ends.com)

...is not actually a Connecticut route, but a New York route spending most of its time in Greenwich. My Route 120A page has a nice map scan explaining this.

5.66 miles; from US 1 in Milford to Route 34 in Orange.

In the 1920s, State Highway 121 followed today's US 44 from US 7 to the New York state line. This road became Route 199 in 1932, and part of US 44 in 1935.

The modern Route 121, commissioned in 1932 from the old SH 195, hasn't changed since then, except for getting shortened when US 1 moved from Cherry Avenue to the Boston Post Road in Milford.

Route 121 is blown off (no interchange) by I-95. Also, Craig Fenn reports that a CT 121 marker on the beginning of the southbound route (just past Route 34) uses a white circle on a black square, a la New Jersey.

• Fenn, Craig W. "A couple road tidbits." Email to Kurumi, Oct. 23, 2000.

• Route 121 Ends (Photos; Doug Kerr at state-ends.com)

3.51 miles; from SR 745 (near I-95) in West Haven to Route 63 in New Haven.

In the 1920s, State Highway 122 followed today's Route 25 between US 1 and US 6.

The modern route 122 dates back to 1932. The original route was:

• today's Route 162, from US 1 in Milford to Ocean Ave. in West Haven
• Ocean Ave. (now SR 705) to Beach St.
• Beach St. to First Ave. Part of Beach St (and part of former Route 122) is now closed to traffic.
• First Ave. to Campbell Ave. (former Route 158)

In 1951, Route 158 was deleted, and Route 122 was extended north, taking over most of Route 158, to Route 63, where its north end is today.

In 1967, Routes 162 and 122 were changed. The south end of Route 122 was truncated to I-95 at SR 745 (First Ave.) Route 162 was extended about 5 miles southwest along former Route 122 to US 1.

Route 122 relocation at Savin Rock

In the early 1960s, a redevelopment plan for the Savin Rock area included relocating Route 122 a couple blocks inland from Beach St. In 1962, the City of West Haven Planning and Zoning Committee announced a comprehensive street plan for the city. This plan recommended that the relocated Route 122 be four lanes wide.

The plan recommended relocating Route 122 between Ocean Ave. and First Ave. This was not completed; but a new late 1980s project harks back to that plan: Capt. Thomas Blvd., a four-lane divided road opened, and a segment of Beach St. was closed. However, Route 122 had already been moved from the area in 1967.

• "Road changes proposed to meet needs." New Haven Register, Aug. 6, 1962.

• Map: Capt. Thomas Blvd. (Google Maps)
• Route 122 Ends (Photos; Doug Kerr at state-ends.com)

From US 1 in Norwalk to NY 35 (connects to CT 35) near South Salem, New York. 8.37 miles in Connecticut.

In the 1920s, State Highway 123 followed former Route 4 between Cornwall and Canton; this is now Route 4 between US 7 and Route 8; and US 202 from there to US 44. At that time, present-day Route 123 north of New Canaan was called SH 184, and south of there, SH 302.

Norwalk Road (today's Route 123) was the first major road in New Canaan, connecting the town to Norwalk Harbor.

The modern Route 123 was commissioned in 1932. Its original alignment, from south to north:

• Riverside Ave. (today's SR 809), from West Ave (US 1) to New Canaan Ave. (Route 123). The exact starting point was erased by US 7 freeway construction nearby.
• today's Route 123 to the New York state line

However, the 1932 official highway map has Route 123 following today's Route 124 south of New Canaan, but its own modern route north of there. By 1934, these highways were swapped in the south to the modern-day 123 and 124 alignments. Curiously, the same thing happened to Routes 104 and 137 in neighboring Stamford.

At some time after 1951, Route 123 was moved from Riverside Ave. to Main St. in downtown Norwalk.

In the 1980s Route 123 was for a time known as Beer Can Boulevard, because of a three-year differential between drinking ages in Connecticut (21) and nearby New York state (18). "Budd" writes: "...teenagers would run across the state line to drink...on returning it was littered with beer cans, wrecked cars and death, earning it its name."

• Chalder, Glenn. "Conditions and Trends: History of New Canaan."

• Route 123 Ends (Photos; Doug Kerr at state-ends.com)

About 20 miles; from US 1 in Darien to US 202 south of Brewster, N. Y. 9.41 miles in Connecticut.

In the 1920s, State Highway 124 followed today's Route 58.

The second Route 124, commissioned in 1932, extended northeast from US 7 in Canaan to end at the Massachusetts state line. It served the Barnes Lime Kiln, about 1.5 miles from US 7. Route 124 became secret route SR 833 in 1963.

MapQuest, which came into existence some time after 1963, used to show this road as Route 124, which would change into an equally nonexistent MA 73 across the border near Clayton. Now CT 124 is gone, but MA 73 is still there:

The modern Route 124 was originally (1920s) called SH 302; then from the 1932 on, it was called Route 29. Across the New York border, the road became NY 394. In 1967, both 29 and 394 were renamed Route 124.

• Route 124 Ends (Photos; Doug Kerr at state-ends.com)