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Highway Engineering

The Design Unit, with technical support from the Survey and Computer Applications Unit is primarily charged with the preparation of contract plans, specifications and estimates necessary for the construction of County highways. When additional right-of-way is required, areas are surveyed and maps are prepared for acquisition under the Eminent Domain Procedure Law.

The Survey Unit provides the Department with information for design of projects.

Survey Information

Suffolk County Bench Marks (631) 852-4114
Suffolk County Control Monuments (contains Horiz. And Vert. data) Download Zip File
Note: You need to unzip the file and use Google Earth to view this information.
Right of Way, Construction, Topo Maps (631) 852-4114
NGS Datasheets (Horizontal, Vertical Control) Go To NOAA Website
Corpscon Go to Army Website
National Geodetic Survey (NGS) Go to NOAA Website
1974 Topographical Maps View Topographical Maps

Suffolk County Government

H. Lee Dennison Bldg

100 Veterans Memorial Hwy
P.O. Box 6100
Hauppauge, NY 11788

Riverhead County Center

County Road 51
Riverhead, NY 11901