page_title: List of county routes in Suffolk County, New York (76–100)
section_title: County Route 99
hierarchical_section_title: List of county routes in Suffolk County, New York (76–100) / County Route 99
caption_attribution_description: English: Images related to the unbuilt off-ramp at the western terminus of Suffolk County Road 99 (Woodside Avenue) and Suffolk County Road 19 (Patchogue-Holbrook Road) in Holtsville, New York. Further details to come later.
context_page_description: County routes in Suffolk County, New York, are maintained by the Suffolk County Department of Public Works and signed with the Manual on Uniform Traffic Control Devices-standard yellow-on-blue pentagon route marker. The designations do not follow any fixed pattern. Routes 76 to 100 are listed below.
context_section_description: County Route 99 is a major county road in the towns of Islip and southern Brookhaven. It runs east and west from CR 19 in Holtsville in the far-eastern town of Islip to CR 16 near Yaphank and Brookhaven hamlet, all in the southern town of Brookhaven.
  Route description
  The western end is a four-lane divided highway that contains a partial interchange with Waverly Avenue, and a full interchange with Buckley Road. It also includes an underpass for a driveway to the Holtsville Branch of the Internal Revenue Service near the Waverly Avenue interchange. This status is reduced northwest of Cannan Lake. Much of the road is a four-lane undivided highway with a center-left-turn lane used for residents and local intersections, except at the intersections of CR 83, Old Medford Avenue, and NY 112, where small concrete dividers run along the median of the road. The center-left-turn lane was previously a painted divider. From west of Old Medford Avenue to west of CR 101 (Patchogue–Yaphank Road), CR 99 borders Medford to the north and North Patchogue and East Patchogue to the south.  Radio station WNYG (1580 AM) is located at the northeast corner of CR 99 and Pennsylvania Avenue.
  After the intersection of Hospital Road, a street which leads to Brookhaven Memorial Hospital, CR 99 runs along the south side of a section of Medford known as The Pines, which includes a local recreational area known as Twelve Pines Park on the northeast corner of Sipp Avenue, and northwest of Pine Gate. The eastern end is also divided with a concrete barrier beginning west of CR 101, and a wider divider east of Station Road, where it resumes its status as a major highway. One last intersection with a housing development that replaced a former dirt road leading to the village of Bellport can be found before CR 99 approaches the Brookhaven town landfill and curves left before terminating at an incomplete at-grade interchange with CR 16 (Horse Block Road) in Brookhaven.
  History
  Woodside Avenue was officially designated as CR 99 on October 27, 1970, as a former Brookhaven town road spanning from Canaan Lake to Station Road in North Bellport It was widened to four lanes and extended during the mid-1970s. West Woodside Avenue which runs west of the north end of Canaan Lake, was a former section of Woodside Avenue.
  At the west end of CR 99, there were originally stubs built for a new ramp and a possible extension beyond CR 19, to either CR 97 (Nicolls Road) or NY 454 (Veterans Memorial Highway). East of CR 16 (Horse Block Road), there were plans to upgrade the interchange into a limited-access one, and extend the road into CR 21 (Yaphank Avenue). The Suffolk County Department of Public Works' official list of County Roads still included the eastern extension as part of the highway in 1986, but the construction of these extensions were never implemented.
  Major intersections
caption: Stub for a never-built west-to-northbound ramp that runs parallel to the existing west-to-northbound CR 99 ramp at CR 19.
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