9.04 miles; from US 5 in Wallingford to Route 22 in North Branford.

It intersects US 5 twice.

In Wallingford, Route 150 shares a one-lane railroad underpass with Route 71, controlled with a traffic light. This underpass, built in 1838, is reported to be the first skew arch underpass built in America.

The state was planning improvements in the area circa 1997, because of increased commercial traffic along US 5, but does not plan to modify the underpass.

In the 1920s, State Highway 150 followed today's Route 156 between Route 82 and US 1.

The modern Route 150 was commissioned in 1932, but has seen some changes over the years. Until about 1950, it started in Cheshire center, going southeast into Wallingford along Wallingford Road, and continuing on East Center Street to near McKenzie Reservoir. (The "to 150" exit on southbound I-91 places you on East Center Street, which originally was Route 150.)

In 1961, it was extended along Northford Road to Route 17. In 1963, it was moved again to its current routing on Northford Road; in addition, the Old Turnpike Road segment to Tracy was added.

• City of Wallingford. "Points of Interest." http://www.town.wallingford.ct.us/Page.cfm?name=Points%20of%20Interest (21 Sept 2003)

Route 150 Ends (Photos; Doug Kerr at state-ends.com)

10.77 miles; from Route 66 in East Hampton to Route 82 in East Haddam.

In the 1920s, State Highway 151 followed today's Route 197, from Route 32 to the Massachusetts state line.

The modern Route 151 was commissioned in 1932; few or no changes since then.

However, in the early 1960s, Route 151 was to be decommissioned. Because of its low traffic counts, the Highway Reclassification Act included a recommendation to delete Route 151, and turn it over to town maintenance.

At the time, a nuclear power plant was proposed near Haddam Neck. A Haddam resident contacted the state highway commissioner, asking that the state delay turning over the route, because of construction and employee traffic that would use the road.

The nuclear plant was never built; but Route 151 was retained.

• "Atom Plant May Alter Rt. 151 Plan." Hartford Courant, Sept. 18, 1962.

Route 151 Ends (Photos; Doug Kerr at state-ends.com)

3.31 miles; from Route 34 to US 1 in Orange.

In the 1920s, State Highway 152 followed today's Route 45.

The modern Route 152 was commissioned in 1932; few or no changes since then. However, the state did intend to decommission the route per the 1961 reclassification act, and this remained in arbitration until 1969. The state ended up keeping Route 152 in the state highway system.

Route 152 Ends (Photos; Doug Kerr at state-ends.com)

5.27 miles; from US 1 in Westbrook to Route 154 in Essex.

In the 1920s, State Highway 153 followed today's Route 82.

The modern Route 153 was commissioned in 1932; it's changed little (or none) since then. Some maps show the northern end following Westbrook Rd. to end at the old Route 80 (now Route 154) in Centerbrook, instead of following Plains Rd.

On Jan. 2, 1967, there was a definite change on the north end, from Westbrook Rd. (which became SR 604) to Plains Rd. (former SR 605). This resulted from the opening of the Route 9 freeway in the area.

• "Rt. 9 Opening To Cause Road Number Changes." Hartford Courant, Jan. 2, 1967.

Route 153 Ends (Photos; Doug Kerr at state-ends.com)

28.24 miles; from Route 9 in Middletown to US 1 in Old Saybrook. Intersects US 1 twice, doing a near 270° loop around South Cove in between. The downtown Old Saybrook section south of US 1 is a four-lane boulevard.

Route 154 is a state scenic highway throughout Haddam as of January 13, 1994. The Mid-State Regional Planning Agency has more info and pictures of historic buildings along the way.

In April 2002, the Hartford Courant stated that Route 154 in Old Saybrook is also deserving of scenic status: colonial houses, saltwater marshes, a causeway across South Cove, and Long Island Sound.

In the 1920s, State Highway 154 followed today's Route 47; around 1930, it annexed Charcoal Avenue, White Deer Rock Road, and part of Middle Road Tpke, connecting Middlebury Center to Woodbury.

At the same time, most of Route 154 was part of New England route NE-10, an ancestor of today's Route 10.

The modern Route 154 was commissioned in 1932, and originally was a small loop south of US 1 in Old Saybrook only, for a length of 6.06 miles. Going clockwise, Route 154 appears to have visited Saybrook Point and Fernwood as now, but then followed Maple Avenue back toward downtown. By 1935 it followed today's route back north, using Old Hammock Road, to end at US 1. The Maple Avenue section became Route 154A.

On Jan. 2, 1967, shortly after the Route 9 freeway opened in Old Saybrook and Essex, Route 154 was extended northward along Middlesex Turnpike (former Route 9) to Essex Road. (There is a very old section of former Route 9 -- Old Middlesex Turnpike and N. Main St., bisected by the railroad -- that was bypassed in the 1930s.)

In Nov. 1984, state Sen. Richard Schneller of Essex introduced a bill to rename Route 9A as Route 154. His reasoning: it would create a simpler, additional route between Old Saybrook and Middletown.

On June 1, 1986, the state made this change. Route 154 was extended further along Middlesex Turnpike to Route 153 at Ivoryton, then absorbed all of Route 9A to Route 9 exit 10 in Middletown.

In 1995, the Main Street section in Old Saybrook was rehabilitated. The crumbled 30-year-old median was replaced with a 6-foot-wide brick median with granite curbing. Twenty-two planters, each with a gas street light, were installed along in the median.

• "Rt. 9 Opening To Cause Road Number Changes." Hartford Courant, Jan. 2, 1967.
• Route Change Notice, ConnDOT, April 2, 1985.
• "Main Street Project Approved." Hartford Courant, Dec. 23, 1994.
• "Work To Start April 10 On Main Street Median." Hartford Courant, March 25, 1995.
• "A Route With A View." Editorial, Hartford Courant, April 9, 2002.

Renumber as part of Connecticut's Great River Road, Route 99.

Route 154 Ends (Photos; Doug Kerr at state-ends.com)

Former numbering for Maple Avenue in Old Saybrook, a 1.85-mile route bisecting the Route 154 loop south of US 1 from southwest to northeast. In 1932, this was part of Route 154 itself; but in 1935, that segment of Route 154 was relocated to Old Hammock Road, and Maple Avenue became Route 154A.

In 1963, Route 154A was deleted and Maple Avenue became a town road. Local officials tried to persuade the state to retain the road, but failed.

• "New Area Roads Discussed by Assembly Committee." New Haven Register, March 6, 1963.