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CONSULTING GROUP, INC. Transportation · Civil · Structural · Environmental · Planning · Traffic · Landscape Architecture · Parking MEMORANDUM SRF No. 0982960 TO: FROM: DATE: SUBJECT: Steve Jankowski, P.E., City Engineer City of Ramsey Matt Hansen, P.E/~ Associate September 17, 1998 TH 47 FROM 142ND AVENUE TO 153RD AVENUE UNDERPASS PEDESTRIAN CROSSING The attached sketch identifies a possible location for a pedestrian underpass from the south side of CSAH 5 (proposed senior housing development) to the north side of CSAH 5. The underpass design consists of a 3.0-meter-wide by 2.4-meter-high box culvert installed during the reconstruction of TH 47 and CSAH 5. The estimated construction cost of the CSAH 5 underpass is $140,000. We previously submitted to you a sketch showing a pedestrian underpass crossing TH 47 south of CSAH 5. As requested, we have reviewed the possibility of locating the TH 47 underpass further to the south than shown on the sketch. It is not feasible to move the underpass southerly due to elevation considerations. In order to maintain adequate cover over the box culvert, the floor of the underpass would be lower than adjacent storm water basins and would require the installation of storm water pumps to keep the underpass dry and in service. The topography of the project area does not allow for a clean design of a pedestrian underpass or bridge overpass crossing of either CSAH 5 or TH 47. The underpass will create the sense of being in a long confined space (approximately 350 feet). The bridge option would obviously be much more open, but would force the user to climb 20 feet in elevation by long ramps, which would be a very circuitous route. Typically, these types of structures are not heavily used when they are placed in the proximity of a traffic signal. MDH/smf Attachment One Carlson Parkway North, Suite 150, Minneapolis, MN 55447-4443 Telephone (612) 475-0010 · Fax (612) 475-2429 · http://www, srfconsulting.corn An Equal Opportunity Employer