In the 1920s, State Highway 300 followed today's Route 104.

In the 1920s, State Highway 301 followed today's Route 182.

7.96 miles; from Route 53 in Danbury to Route 25 in Newtown.

In the 1920s, State Highway 301 followed today's Route 124.

In 1932, the current Route 302 started as part of the original Route 34, which extended into Danbury. In 1935, US 202 was commissioned; its original route took over the the Newtown - Danbury section from Route 34. On May 1, 1974, US 202 was shifted north to its current route through New Milford and Torrington. The Newtown - Danbury stretch was divided among Route 53 and the new Route 302.

• Route 302 Ends (Photos; Doug Kerr at state-ends.com)
• Route 302 - Google Maps

In the 1920s, State Highway 303 followed Thompsonville Road in Suffield, the Thompsonville Bridge across the Connecticut River, and Main Street in Enfield, ending at US 5.

In 1932, SH 303 became part of the original alignment of Route 190. In 1967, a new Connecticut River bridge opened to the south, and the former SH 303 became unposted SR 590. Within a few years, SR 590 was turned over to the towns, and the Thompsonville Bridge was demolished.

• Route 190

In the 1920s, State Highway 304 followed today's Route 33, from US 7 in Wilton to Route 35 in Ridgefield.

3.42 miles; from Route 187 in Bloomfield to Route 159 and Route 75 in Windsor.

In the 1920s, State Highway 305 followed today's Route 315.

An afterthought, in a way

Route 305 started out as a highway the state did not want.

Today's Route 305 comprises Bloomfield Avenue in Windsor, and Old Windsor Road in Bloomfield (a mirroring found in many neighboring towns). In 1961, as the state highway reclassification was underway, the 2.45-mile Windsor portion was state-maintained, as unposted SR 905. The Bloomfield portion was a town road.

SR 905 was scheduled to be deleted from the state system, leaving the road completely under town maintenance. Instead, probably resulting from negotiations with the two towns, the state instead announced it would add the Bloomfield portion connecting to SR 905 to its highway system in late 1962. In 1963, the extended SR 905 became signed route 305.

Until guide signs were revised in the 1980s, the exit signs for Route 305 on I-91 read "Bloomfield Avenue / Windsor" with a Route 305 shield tacked onto the top border.

Extension to Route 189 pondered

In early 2004, Bloomfield officials pursued a federal grant to study improving Route 305 and building a new connector road westward to Route 189. Construction, if deemed warranted, could take up to 20 years.

The 2-mile connector road would extend westward from the 187/305 intersection, crossing West Dudleytown Road and Peters Road, to end at Tunxis Avenue (Route 189). Planners believe it might relieve traffic congestion at Cottage Grove Road (Route 218) and Blue Hills Avenue Route 187.

In November 2007, the Capital Region Council of Governments (CRCOG) started a corridor study for all of Route 305, including the proposed extension. A longer Route 305 could help separate residential areas to the south from industrial areas to the north, and relieve traffic from nearby local streets. Several public hearings would "(h)elp identify a clear community vision as to how the road should look and function." The study is expected to complete in January 2009.

• Connecticut State Highway Department. Biennial Report of Alterations to the State Highway System, dated 1963.
• "King to Report Tuesday On Takeover of Road." The Hartford Courant, Dec. 10, 1962.
• "Town to seek funding for study of state route." Bloomfield [Conn.] Journal, Feb. 19, 2004.
• "CRCOG presents outlines and goals." Windsor [Conn.] Journal, Dec. 6, 2007.

• Route 305 - Google Maps
• CRCOG Transportation Study: Route 305

In the 1920s, State Highway 306 followed today's Route 59 from Bridgeport to Easton, then followed Center Road (old Route 106) to end at Route 58.

In the 1920s, State Highway 307 followed today's Route 140, between US 5 and Route 83.

No longer assigned. In the 1920s, State Highway 308 followed today's Route 111, between Route 25 and Route 34.

4.74 miles; from Route 167 in Simsbury to Route 179 in Canton. The portion between Route 167 and the Canton town line (also known locally as Old Farms Road, Westledge Road and North Canton Road) was under consideration as a state scenic road in 1999.

The modern Route 309 was commissioned in 1963. Part of it was formerly unsigned SR 909. In 1966, the state cited an "urgent need" to realign about a mile of Route 309, from Stratton Brook to Hop Brook (Roughly Mountain Road to Route 167). It appears that this was never done, though some minor work was done near the high school at the east end of Route 309 in 1970.

• "8 Highway Projects Planned." The Hartford Courant, Apr. 4, 1966.
• "State Claims Repairs For Rt. 309 Years Away." The Hartford Courant, Nov. 5, 1973.

• Route 309 Ends (Photos; Doug Kerr at state-ends.com)
• Route 309 - Google Maps