Succeeded by: RR 504.

Some portions of the original road near its intersection with ON 5 were stubbed off by a later realignment.

Adjustments: CR 5 originally had its north terminus at ON 5, resulting in a route length of 4 km. The route was extended north to Millgrove by 1967.

Succeeded by: RR 505.

Added by 1952, and struck from the list of numbered roads by 1973.

Succeeded by: Unnumbered road.

Adjustments: The original configuration of CR/RR 6 covered a considerable distance in the Red Hill Creek Valley, which was then outside Hamilton city limits. The city encroached on the road by 1952, and by 1960 the entire portion north of Mt. Albion was subsumed into the street grid.

Due to the construction of the Lincoln M. Alexander and Red Hill Valley parkways in the 1990s and 2000s, the course of CR/RR 6 became bisected in four places and is no longer drivable in its entirety:

• Mt. Albion Rd. no longer connects directly to King St. due to construction of new interchange; access moved to Lawrence Rd. slightly west.
• The portion of Mt. Albion Rd. skirting the west edge of Glendale Golf Club is now closed to motorized traffic.
• Mt. Albion Rd. and a connecting segment of Mud St. were bisected by the Red Hill Valley Parkway at their intersection, actually leaving a portion of abandoned road in the middle of the interchange!
• Upper Mt. Albion Rd. was bisected by the Lincoln M. Alexander Parkway, leaving two stubs that no longer connect.

Succeeded by: RR 406.

Followed Flamborough East Concession Line 4.

Adjustments: In 1958 the Aldershot portion of Wentworth County was annexed by the city of Burlington in Halton County, resulting in the Wentworth-maintained portion of this route being truncated by 6 km. By 1969, CR 7 was realigned east of Mill Street to follow CR 7A's former course east to the Halton County line.

Succeeded by: CR 9 (pre-1969 alignment), RR 507.

Added by 1952, initially as an insignificant stub road entirely within Waterdown village limits; extended to the county line by 1960. Followed East Flamborough Concession Line 4. Incorporated into the CR 7 parent route by 1969.

Succeeded by: RR 7, RR 507.

CR 8 was originally the longest numbered route in East Flamborough Township, though its configuration changed several times in its history. Much of the original southern extent of the road now falls within the natural areas of the Royal Botanical Gardens, and is no longer accessible to motorized traffic.

Adjustments: In 1958 the Aldershot portion of Wentworth County was annexed by the city of Burlington in Halton County, resulting in the south end of the Wentworth-maintained portion of this route being truncated by 6 km. The route was extended north to Mountsburg by 1952, more than compensating for the lost distance. CR 8 was taken off of Main Street in Waterdown by 1974, resulting in its final endpoint at Parkside Drive.

Succeeded by: RR 508.

Note: Presently, Centre Road no longer connects directly to Main Street.

Struck from the list of numbered roads in 1967. The number was subsequently reused.

Succeeded by: Unnumbered road.

Note: Presently, Old Guelph Road no longer connects directly to ON 6.

CR 10 was the only Wentworth County road that was split between directional alignments with "E" (east) and "W" (west) suffixes. Even more strangely, the alignments never touched each other, though both branched off from CR 15 to skirt the edge of the Niagara Escarpment.

By 1960, all but 1.4 km of CR 10W became subsumed within Hamilton city limits. By 1969 this segment had been renumbered as simply "10," since CR 10E had by then disappeared from the map.

Succeeded by: RR 210.

Followed Saltfleet Concession Line 7.

Succeeded by: RR 411.

In the late 1990s, the portion of Mud Street near RR 11's historical terminus was realigned to interface with the Lincoln M. Alexander Parkway, leaving behind a stub named Old Mud.

CR 12 consisted of the portion of King Street falling outside Hamilton city limits. As the city limits expanded east between 1940 and 1960, CR 12 was progressively trimmed, eventually settling into a 3 km stub with Centennial Parkway (ON 20) as its west terminus.

Succeeded by: RR 112, RR 412.

Verified as a numbered road from 1952 to 1967, then subsumed as a Dundas city street. The number was subsequently reused.

Succeeded by: Unnumbered road.

The east portion of this road follows Concession Line 6 and became subsumed within Hamilton city limits by 1952, resulting in the abbreviation of the numbered designation on later maps.

Adjustments: The routing of Mohawk Road was altered by the construction of ON 403 in the 1960s, resulting in a stub called Old Mohawk Road. The routing was altered again when the Lincoln M. Alexander Parkway was completed in the 1990s, extending the Old Mohawk stub and leaving Mohawk Road itself as a discontinuity.

Succeeded by: RR 115, RR 215.

An odd, J-shaped alternate fork for Mohawk Road. Added by 1952, and struck from the list of numbered roads by 1967.

Succeeded by: Unnumbered road; CR 48, RR 248 (McNiven segment)

Adjustments: CR 16 originally had its north terminus at ON 2. By 1973 it had been extended north a trivial distance to intersect with CR 23, commissioned at the same time.

Succeeded by: RR 216.

Followed East Flamborough Concession Line 13.

Succeeded by: RR 518.

Succeeded by: RR 519.

Adjustments: CR 20 originally ended at Concession Road 6 West in Westover, resulting in a route length of 6 km. By 1969, the route was extended north to Safari Road (CR 1).

Succeeded by: RR 520.

Followed West Flamborough Concession Line 5.

Adjustments: CR 21 originally terminated at Brock Road (CR 4) in Haysland, resulting in a route length of 5 km. Lengthened westward by 1977.

Succeeded by: RR 521.

Followed Ancaster Concession Line 7, Glanford Concession Line 6, and Binbrook Concession Line 4, as well as a portion of the Wentworth-Brant county line.

Adjustments: CR 7 originally terminated at Sawmill Road on the Brant County line, resulting in a route length of 24 km. By 1952 it was extended to meet in line with ON 52. Several jogs at township lines have also been straightened over the years. These changes are explained in more detail on the RR 65 page.

Succeeded by: RR 222 (1979-2005), RR 622 (1979-2005), RR 65 (2005-present). This was the longest of Hamilton-Wentworth's county and regional roads from this era, and the only one that's still signed with a number today.

CR 23 followed the course of Stoney Creek's namesake stream upon a parallel road that had once formed an alternate route for Highway 8 in the 1920s. The north extremity of the road was bisected by the QEW by 1940, forming a discontinuity. By 1960 over half the route had been consumed by Hamilton city limits, leaving the CR 23 designation reduced to a 2 km stub in Stoney Creek.

Previously: ON 8A, ON 20 (north segment).

Succeeded by: Unnumbered road. The number was subsequently reused.

Followed Saltfleet Concession Line 2. In its original configuration, CR 24 deviated south along what is now Melvin Avenue for a short distance immediately west of Red Hill Creek. By 1960, the portion of the road west of Grays Road had become subsumed by Hamilton city limits.

Adjustments: The east extent of CR/RR 24 appears to have changed several times. 1940 maps show CR 24 turning at Winona Road and ending at ON 8, with an unlabelled spur providing access to a train depot. By 1952 (1960 map), the terminus turn had been moved east to Fifty Road...but the Winona Road forks remained as a concurrent part of CR 24. This came to an end by 1967, and later maps showed CR/RR 24 ending at Fifty Road just shy of Highway 8.

Succeeded by: RR 424; CR 56, CR 50, RR 450 (east terminus).

Adjustments: This road originally had an L-shaped routing. By 1969, CR 25 was taken off of Tapleytown Road and moved to what had previously been CR 25A, running parallel to ON 8 atop the escarpment. The former route became an extension of CR 34.

Succeeded by: CR 34, RR 425, RR 434.

Added by 1952; unnumbered before. Followed Saltfleet Concession Line 4. Incorporated into the CR 25 parent route by 1969.

Succeeded by: CR 25, RR 425.

CR 30 was one of Wentworth County's most bewildering numbered roads. 1940 maps show it as a multi-pronged assemblage of intersecting streets, clustered west of 5th Street on the Hamilton Mountain. By 1952, the west end of 30 had been extended through the Mountain Sanitorium grounds...and the rest had become subsumed within Hamilton city limits. By 1960, the west end had also been absorbed. The full extent of the bits and pieces of CR 30's routing was 5 km, though it's unknown if they were all officially part of the route at the same time.

The number was subsequently reused.

Succeeded by: RR 157, RR 117.

By 1960, this road had become subsumed within Hamilton city limits. The number was subsequently reused.

Succeeded by: RR 156.

Adjustments: CR/RR 33 originally terminated south of White Church Road, with a route length of 7 km. By 1952, it had been extended south to its ultimate terminus.

Highway took a jog west at White Church Road via an invisible 600m concurrency with RR 622. By 1960, Hamilton city limits had encroached on its north end.

Succeeded by: RR 133, RR 633.

Adjustments: By 1974, RR 34 was truncated south of Binbrook Road, leaving the extant part of the route with a 12 km length.

Succeeded by: RR 434, RR 634 (north of Binbrook Road).

This was one of two numbered county roads that passed through an area ceded to the Region of Waterloo in 1973, resulting in a 6-kilometre truncation. Part of the ceded portion became North Dumfries Township Road 27A; however, it's not signed in the field.

Adjustments: CR 35 originally terminated at ON 97, resulting in a route length of 13 km. By 1952 a small jog at the intersection with Concession Road 5 was smoothed out, and by 1960 the route had been extended to Clyde. The 1973 cessation resulted in the route being truncated to Safari Road (RR 1) in Sheffield, assuming a length of 8 km.

Succeeded by: RR 535 (south of Safari Road)

Followed East Flamborough Concession Line 9.

Succeeded by: RR 536.

Added by 1952 as a stub road connecting ON 6 to Mount Hope's schools; unnumbered before. Extended by 1960. Followed Glanford Concession Line 5.

Succeeded by: RR 637.

Added by 1952; unnumbered before.

This was one of two numbered county roads that passed through an area ceded to the Region of Waterloo in 1973, and the only one completely within the ceded area. It followed Beverly Concession Line 10, and had no direct connection to other Wentworth County numbered roads until CR 35's designation was extended to Clyde circa 1960.

Succeeded by: Waterloo RR 27

Added by 1952; unnumbered before. Followed Beverly Concession Line 2. Took a very short jog along Middletown Road at the east end. Struck from the list of numbered roads by 1977.

Succeeded by: Unnumbered road.

Added by 1952; unnumbered before.

Adjustments: CR/RR 40 originally terminated south of Binbrook Road, with a route length of 6 km. By 1977, it had been extended south to its ultimate terminus.

Succeeded by: RR 640.

Added by 1952; unnumbered before.

Adjustments: By 1967, the route had been truncated east of its intersection with Centre Rd. (CR 8).

Succeeded by: RR 543 (west of Centre Rd).

Added by 1952; unnumbered before.

Adjustments: By 1967 CR 44 had apparently been truncated from Main Street to King Street in Dundas (though some maps continued to show this portion of the route). By 1977, the south end of RR 44 was routed away from York Road onto the newly-constructed Olympic Drive. The prior alignment within Dundas became a second incarnation of RR 44A (below).

Succeeded by: RR 44A, RR 344, RR 354, RR 364.

The original incarnation of CR 44A ran along Valley Road. It was added by 1952, and struck from the list of numbered roads by 1973.

Succeeded by: Unnumbered road.

Added by 1952. By 1960, Hamilton city limits had encroached on the north portion of the road.

Succeeded by: RR 145, RR 445. Street name also given as Gray Rd; no consistency.

Formerly: ON 5B (1938-40)

Concurrent with: ON 99.

CR 46 is an anomaly; a sub-kilometre stub road running concurrently with ON 99 in Dundas. It may have been an internal designation referring to the portion of ON 99 under local maintenance. It appeared on maps from at least 1952 to 1963, by which point ON 99 had been moved off of CR 46 and onto CR 46A (below).

Succeeded by: RR 330.

Concurrent with: ON 6.

About 1959, the east end of ON 99 in downtown Dundas was moved off of Ogilvie Street and onto a newly-built block-long extension of Governors Road. This resulted in the previously-concurrent CR 46 briefly gaining a "46A" companion, reflecting its status as a connecting link under municipal maintenance.

Verified as a numbered road from 1952 to 1967, then subsumed as a Stoney Creek village street. The number was subsequently reused.

Succeeded by: Unnumbered road.

Added by 1952. By 1960, this road had become subsumed within Hamilton city limits. The number was subsequently reused.

Succeeded by: RR 167.

CR 50 was extremely short-lived as a numbered road, being added at some point after 1952, then absorbed into the Hamilton street grid by 1960. The 1960 map still shows the road's number, though it doesn't highlight its routing. The number was subsequently reused.

Like CR 50, CR 51 was a short-lived numbered designation that came after 1952 and went away before a decade was even through. 1960 map view, showing the road enveloped by city limits. The number was subsequently reused.

The Upper Horning portion of this route was bisected by the Lincoln M. Alexander Parkway in the 1990s, and is no longer drivable as a through road. The configuration of Stone Church Road has also been changed since the 1950s, removing its direct connection to Upper Horning Road.

Succeeded by: RR 116.

Previously: ON 5 (1925-27) and ON 6 (1927-5?). Section was left behind by a bypass before 1960.

Succeeded by: RR 652.

Added after 1952 and before 1960.

Adjustments: This highway was made discontinuous in 1960 due to being bisected by the 12-30 runway of the Hamilton International Airport.

Succeeded by: RR 253.

Added by 1960; unnumbered before. This road was newly-constructed, and effectively replaced the segment of CR 8 it ran parallel to.

Succeeded by: RR 554.

Previously: A very short segment abutting ON 8 was once part of RR 24.

CR 56 appeared by 1967. It was Hamilton-Wentworth's highest sequentially-numbered county or regional road...but its designation was short-lived. By 1973, the road was lengthened south to a new terminus north of Fulton in the Niagara Region...and it was renamed CR 50 in deference to Fifty Road and the nearby Fifty Mile Point on Lake Ontario.

Succeeded by: CR 50, RR 450.