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Attachment A Ferry Street Bridge Modeling L-COG Project Work Program March 1, 1989 Objective: Assist the City of Eugene Public Works Department by prepar- ing traffic volume forecasts for Ferry Street Bridge alternatives devel- opment and environmental analysis. L-COG presently maintains and operates a mainframe-based computer model for the metropolitan area. L-COG utilizes the Urban Transportation Planning System (UTPS) and makes use of a variety of other data sources in the Regional Information System including the geographic data system. II. WORK PROGRAM There are seven major components of the work program for the Ferry Street Bridge project. A. Refine Traffic Analysis Zones and Node-Link System Refine the zone and node-link systems in a manner similar to that done for Eugene's Central Area Transportation Study. Some zones are so large that traffic forecasts will likely be less precise than required for project-level analysis. The areas in which existing traffic analysis zones (TAZs) would be split into smaller ones are those likely to influ- ence travel patterns for the Ferry Street Bridge analysis. A refined zone system was developed for the downtown Eugene area for the Central Area Transportation Study (CATS) and will provide a good basis for the zone refinement, but other refinements will be needed. Some of the zones which clearly need to be addressed are in the vicinity of River- front Research Park, Goodpasture Island, the southern part of River Road and much of the Willakenzie area. Refinement of the traffic analysis zones and node-link system is expected to provide more accurate fore- casts needed for this project-level analysis. B. Update Base Year Trip Generation and Attraction Data Update employment and dwelling unit information for the metropolitan area since these are the key elements of trip generation and attraction. Because there has been relatively little growth in the past several years, the existing base year data is reasonably valid on an areawide basis. However, some parts of the community have changed significantly. The 1986 employment data is already available at L-COG; with some effort it can be allocated to traffic analysis zones in the Ferry Street Bridge area. (A parallel effort for the remainder of the metro area can be accomplished under activities included in L-COG's Unified Planning Work Program.) Some special allocation work will be required to account for multiple employment sites of certain employers. L-COG's ability to specify the new zone system in the Geographic Information System will allow allocation of dwelling unit data from 1987. or 1988 to be accom- plished fairly quickly and simply.