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7a_supp May 10, 2011 West Mercer Place Port of Seattle Commission May 10, 2011 SDOT Seattle Department of Transportation Completing the Vision For Two-Way MERCER WEST Mercer St From I-5 to Elliott Ave W WEST MERCER PLACE TWO-WAY CONVERSION MERCER UNDERPASS Create a direct connection from I-5 and SR 99 to Add a new option for freight from I-5 to Interbay Seattle Center, Uptown, Queen Anne, and Interbay Connect the Uptown and S Lake Union urban Improve pedestrian and bicycle connection across centers 2 SDOT SR 99 Enhance transit access Seattle Department of Transportation Why consider changes to MERCER WEST West Mercer Place? Existing Viaduct AWV Replacement / Bored Tunnel Mercer connects to I-5 Mercer connects to SR 99 & I-5 Elliott connects to SR 99 in Belltown Elliott connects to Alaskan Way SDO T 3 Seattle Department of Transportation Why consider changes to MERCER WEST West Mercer Place? Limited pedestrian and bicycle connections No sidewalks or bike lanes on West Mercer Place SDOT 6 Seattle Department of Transportation MERCER WEST Existing Conditions Left-turn lanes back up into Existing Slide Area through lanes Residential Neighborhood Kinnear Park WEST MERCER PL Steep Driveway Merge Point Grades Up to 8% = SDOT-owned Right-of-Way No Sidewalks SDOT 5 Seattle Department of Transportation Potential Impacts: MERCER WEST Existing Parking SDOT 6 Seattle Department of Transportation MERCER WEST Analysis Kinnear Park WEST MERCER PL Potential Benefits: Potential Consequences: Improve pedestrian and bicycle Kinnear Park connection with Uptown Parking and Access Walls Reduce Delay Noise o Mercer Street Cost o Elliott Ave W SDOT 7 Seattle Department of Transportation New Sidewalk extend to Elliott Ave W. MERCER WEST Alternative 1 A B New Sidewalk 250' Retaining Wall A - B SDOT 8 Seattle Department of Transportation Uphill Bike Lane & New Sidewalk MERCER WEST Alternative 2 A B New Bike Lane New Sidewalk 330' Retaining Wall A - B SDOT 9 Seattle Department of Transportation Extend the Merge Lane half-way up the hill MERCER WEST Alternative 3 380' Retaining Wall A B New Bike Lane New Sidewalk 330' Retaining Wall Extend Merge Lane to Here A - B SDOT 10 Seattle Department of Transportation Extend the Merge Lane to the top of the hill MERCER WEST Alternative 4 700' Retaining Wall Reconfigure Driveway A B New Bike Lane Extend Merge 330' Retaining Wall New Sidewalk Lane to Here A - B SDOT 11 Seattle Department of Transportation Extend the Left-Turn Lane Storage MERCER WEST Alternative 5 Extend Queue 225 ft Existing to 350 ft Queue Extend the southbound left-turn lanes on Elliott Ave W Compatible with all alternatives, including existing condition Reduce delay Reduce back-up on Elliott Ave W SDOT 12 Seattle Department of Transportation MERCER WEST Traffic Modeling Traffic Modeling Includes: SR 99 Bored Tunnel Waterfront construction with Tunnel open (2016-2017) Tunnel and Waterfront complete (2018) Twenty-year growth (2030) Nickerson St / Dexter Ave N Population and Employment Growth Regional PSRC Forecasts Consistent with the Seattle Comprehensive Plan POS North Bay Alternative 4 (Industrial Development under existing zoning) 635 Elliott Ave Truck Volumes Cruise ship operations during the summer months RapidRide SDOT 13 Seattle Department of Transportation AWV Peak Hour Traffic Projections MERCER WEST At Elliott / W. Mercer Pl SB Elliott Ave Left-Turn 2010 SB Elliott Ave Through 2010 WB Mercer Pl 2010 NB Elliott Ave Through 2010 (1) "Waterfront Construction" = Tunnel is open to traffic. Construction on surface Alaskan Way. (2) "Program" = Tunnel open with surface Alaskan Way, Elliott/Western, and Mercer West Two-Way Conversion completed. SDOT 14 Seattle Department of Transportation AWV AM Peak Hour Traffic Projections MERCER WEST At Elliott / W. Mercer Pl SB Elliott Ave Left-Turn 2010 SB Elliott Ave Through 2010 WB Mercer Pl 2010 NB Elliott Ave Through 2010 (1) "Waterfront Construction" = Tunnel is open to traffic. Construction on surface Alaskan Way. (2) "Program" = Tunnel open with surface Alaskan Way, Elliott/Western, and Mercer West Two-Way Conversion completed. SDOT 15 Seattle Department of Transportation AWV PM Peak Hour Traffic Projections MERCER WEST At Elliott / W. Mercer Pl SB Elliott Ave Left-Turn 2010 SB Elliott Ave Through 2010 WB Mercer Pl 2010 NB Elliott Ave Through 2010 (1) "Waterfront Construction" = Tunnel is open to traffic. Construction on surface Alaskan Way. (2) "Program" = Tunnel open with surface Alaskan Way, Elliott/Western, and Mercer West Two-Way Conversion completed. SDOT 16 Seattle Department of Transportation Truck Volumes MERCER WEST Number of Trucks West Mercer Place / East of Elliott Avenue West 50 45 40 Actual Number of Trucks 35 30 8 25 3 7 20 3 15 9 5 4 26 10 21 18 18 2 0 3 13 5 11 11 7 7 8 7 3 0 1 1 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 Data Collected September 2010 (after the Nickerson St. re-channelization) SDOT 17 Seattle Department of Transportation Truck Percentages MERCER WEST Percent of All Traffic West Mercer Place / East of Elliott Avenue West 10% Trucks as a Percent of ALL Traffic (%) 8% 6% 6% 4% 4% 4% 4% 4% 3% 3% 3% 2% 2% 2% 1% 1% 0% 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 Assumption for analysis: Trucks make up 5% of future Data Collected September 2010 (after the Nickerson St. re-channelization) a.m. peak period traffic volume on West Mercer Place. SDOT 18 Seattle Department of Transportation Travel Time Savings MERCER WEST For Eastbound Traffic Alternative 3: Alternative 4: Alternative 5: Projected Travel Time: Extend merge lane Extend merge lane Extend left-turn lanes Elliott Ave W to I-5 half way up the hill. all the way up the on Elliott Ave W. without improvements hill. on West Mercer Place [Seconds saved] Future Condition: [Seconds saved] [Seconds saved] 2016: AM Peak Autos: 0 (0) 1 (1) 43 (41) * Waterfront construction Trucks: 0 (0) 4 (3) 52 (41) * with Tunnel open. 2018: AM Peak 8 minutes Autos: 0 (0) 3 (3) 4 (4) * Tunnel and Waterfront (480 seconds) Trucks: 0 (0) 5 (5) 5 (5) * Complete. 2030: AM Peak Autos: 0 (0) 2 (2) 6 (7) * Future condition. Trucks: 0 (0) 5 (5) 13 (14) * Cruise ship traffic volume travel time savings are shown in (parenthesis). Alternative 5 Travel Time saving is reduction in delay for the left turn to West Mercer Place at Elliott. Alternative 5 reduction in delay for southbound Elliott Ave would be 3 to 27 seconds SDOT 19 Seattle Department of Transportation MERCER WEST Alternatives Summary Alternative 1: Alternative 2: Alternative 3: Alternative 4: Alternative 5: Add Add Add Add Extend left-turn - 8 ft sidewalk. - 8 ft sidewalk, - 8 ft sidewalk, - 8 ft sidewalk, lanes on Elliott - 5 ft bike lane. - 5 ft bike lane, - 5 ft bike lane, Ave W - Extend merge - Extend merge lane half way up lane all the way the hill. up the hill. Travel Time Reduction: 0 seconds 0 seconds 0 seconds 1-5 seconds 4-52 seconds Kinnear Park - - Modified Modified - Vehicle Entrance: Parking (approx # of spaces): 4 11 11 23 / 4 - Wall length: 250 ft south 330 ft south 330 ft south 330 ft south - 380 ft north 700 ft north Traffic lanes Traffic lanes Noise: - - - closer to homes closer to homes Estimated Cost: $2.7 Mil $4.2 Mil $8.0 Mil $12.9 Mil $0.2 Mil SDOT 20 Seattle Department of Transportation MERCER WEST Mercer Corridor Schedule July 28, 2010 SDOT 21 Seattle Department of Transportation MERCER WEST If you have any questions, please visit: http://www.seattle.gov/transportation/mercer_west.htm Or contact: Eric Tweit Mercer West Project Manager QR code for the website mercerwest@seattle.gov (206) 684-8834 SDOT 22 Seattle Department of Transportation VISSIM Traffic Model MERCER WEST Existing 225' Left-Turn Pockets SDOT 23 Seattle Department of Transportation
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