Thurston GeoData CenterThis feature class is maintained in coordination with the addressing authorities of Thurston County Development Services and the Cities of Olympia, Lacey, Tumwater, Yelm, and Rainier. The intent of this data is to provide emergency services with the earliest address plan for new developments even while the development is under construction. Street centerlines are initially digitized from center of right-of-ways shown on survey plats and are then updated when a new orthophoto becomes available. Unnamed roads, driveways, planned roads, alleys are only intended for graphic display. These segments are generally not topologically connected to addressed streets. This feature class is used as the street centerline source for TCOMM911 Operations Center (CAPCOM) CAD/Ti Geo file load and Maverick Map data. As of 1/06, edits in this data regarding exact street name and begin/end address ranges are also entered in the County's Master Street Address Guide through Intrado's 911Net database maintenance request site. Layer/Field Explanation: Street centerlines are initially digitized from center of right-of-ways shown on preliminary plats and updated in final survey plats. If this source is delivered in hard copy, then the document will be scanned and the image georectified using common parcel corners found in the source and in the County parcel layer. Some centerlines are imported directly from digital survey drawings. When a new orthophoto becomes available, the centerlines are reviewed again and adjusted and/or vertex weeded as necessary . Theoretical address ranges are used to extend valid ranges beyond physical addresses. This will influence the positional quality of geocoded points if used as a reference source. It should be noted that the County Development Services Addressing Department does not assign house numbers where the right two digits exceed the number 49. For emergency services, address ranges need to be continuous where the physical street is continuous and maintain 100 block interval changes at intersections. As a result, geocoded points are likely to be skewed toward the lower end of each address range. Zero address ranges will not be used on any name/addressed street types. Any named and signed road without address ranges will default to a 100-199 address range Speed Limit- This attribute was created using the best available information at the time. Use with caution. Limited access segments (I5 and US 101) have been assigned address ranges based on mile post location. Decimal house numbers are not valid so mile post address ranges have been multiplied by 100. CITY_L and CITY_R are used to define msag community, not postal community. Unincorporated areas and those within the City of Olympia are given the community of 'OL'. A list is posted to the County GeoData Center showing unique street names selected by all jurisdictions within the county for addressing officers to consult in selecting street names, http://www.geodata.org/capcom.aspx. Capcom's policy requires that new street names are unique regardless of jurisdiction and street type. Unnamed roads, unofficially named roads, driveways and alleys are identified as TYPE=5. Special characters in street names are not valid. Hyphens are generally replaced with a space character. Forest roads within Capitol Forest are being captured with proper WA DNR road identification based on DNR map. The address range applied to forest roads is based on distance in miles x 100 from the trunk in which branching road extends.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/45da5ea1a3694e2298414dfc1abf427a_0engThurston GeoData CenterPublicThurston Street Address TCOMM [Washington (State)--Thurston County]Web servicesWashington (State)--Thurston CountyWashington (State)Last Modified: 2025-05-05