Welcome to the City of Gresham’s Control Points GIS map. The City has developed a network of horizontal and vertical control monuments throughout the city to support surveying, engineering, construction, mapping, GIS and facilities management activities.
Engineers, surveyors, planners and other consultants working on public improvements are required to georeference their work to the City's vertical and horizontal datum.
This web application displays the main control point’s location and its spatial information.
Each control point is typically a standard City of Gresham 2-inch bronze disk monument with a raised datum point (Berntsen Model CD2LB), stamped "City of Gresham Control Do Not Disturb".
The City of Gresham provides no warranty, expressed or implied, as to errors, omissions, suitability of purpose or positional accuracy, of City control points. Use of these control points requires due diligence, by the professionals using the information, to ensure the accuracy and appropriate use of the control.
The monuments shown here have superseded all previous City of Gresham control points. The legacy control points have been purported to be on the same datum but present considerable variation in origin, type, permanence and methodology. The new network has consistency in type, location and methodology.