The Sprain Brook proposal sat on the table until 1949, when the State Council of Parks, run by Robert Moses, sought to ease congestion on the Bronx River Parkway.

Construction of the alternative highway began in 1958, with the stretch from the Bronx River Parkway to Tuckahoe Road.

The authority was abolished in 1979, at which time, all maintenance of the Sprain Brook Parkway was turned over to NYSDOT.

The Sprain Brook Parkway, designated by the New York State Department of Transportation as NY 987F, a state reference route,[1] begins at a fork from the Bronx River Parkway along the latter's right-of-way along the Bronx River in the city of Yonkers.

Leaving Yonkers for the town of Greenburgh, the lanes of the Sprain Brook come back together, reaching an interchange with Jackson Avenue.

After turning northward once again, the Sprain Brook crosses under a former alignment of NY 131 (Underhill Road) and passes by the Sunningdale Country Club.

[3] Continuing its north/northeast winding, the Sprain Brook enters an interchange with NY 100B (Dobbs Ferry Road), passing by East Rumbrook Park.

The stretch between NY 100 in Yonkers and Jackson Avenue in Greenburgh sees the second-highest, at 100,900, which is an upgrade of over 19,000 vehicles since the same report in 1997.

[9] In January 1939, the village of Bronxville joined the opposition, deeming the new parkway as a "needless expenditure of public money" that would adversely affect local property values and cause flooding.

[10] In April 1941, county officials admitted that it was likely that the $7 million appropriated would not be enough, and instead it would be better spent on improving other nearby parkways.

This new parkway would be one of the construction projects involved, which included rebuilding the Bronx River and the development of Ridge Road Park.

The Moses-led committee also suggested that $25,000 be appropriated for a study, survey and report on the new parkway and possible expansion of the Ridge Road Park.

Residents in Yonkers protested that this December 1949 transfer would require the demolition or defacing of $1 million worth of homes in the city.

The parkway, if started, would take about three years to complete and would be constructed by the Taconic State Park Commission.

[14] In February 1951, Westchester County started getting ready to approve the new parkway plans from the State of New York.

The State Council of Parks wanted to use the alignment used by the Odell Parkway, which still would require demolition of thirty homes in the Cedar Knolls section of Yonkers, while other groups wanted the parkway to be aligned through Crestwood, which would cost 100 homes.

[4] In July 1951, the county of Westchester approved "Route A", one of the proposed alignments for the Sprain Brook through the city of Yonkers.

A hearing was held on June 18 that mentioned that only "Route F-1", which would cost $14.579 million, and was longer would be the only other acceptable proposal.

Jefferson Armstrong declared the new plan as a scheme by Robert Moses to "spend beyond his pocketbook" and that Gerlach was "intolerant" for proposing this just before the start of the holiday season.

[17] On September 30, 1958, the State Department of Public Works notified Westchester County that it would begin construction of the Sprain Brook Parkway.

At that point in North Yonkers, it would meet with a connector to the New York State Thruway, which could open doors to getting tolls on the new roadway.

[18] The section of the Sprain Brook Parkway between Tuckahoe Road and Jackson Avenue in the town of Greenburgh was slated to cost $4.103 million ($43 million in 2024), a stretch of 2.6 miles (4.2 km) with 3.45 miles (5.55 km) of access roads.

The new interchange with Jackson Avenue would also serve Sprain Ridge Park, which was also being opened at the same time as the new parkway.

[20] The 5.2-mile (8.4 km) long section of the Sprain Brook Parkway was opened on November 27, 1969 from Jackson Avenue in Greenburgh to the Cross Westchester Expressway in Elmsford.

[21] The delay of the final 2.7 miles (4.3 km) long portion of the Sprain Brook from the Cross Westchester Expressway and the Taconic State Parkway near Hawthorne Circle spent multiple years without progress until demands were placed upon Governor Hugh Carey to get state funds attached to the project.