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Home My WebLink AboutRS_Cascade Crest_Trip Generation Analysis_260713_v11011 E Main Ave Suite 453 | Puyallup, WA | 98372 (253) 770-1401| heathtraffic.com Date: February 19, 2026 To: Cliff Williams, P.E. Development Management Engineers, LLC From: Aaron Van Aken, P.E. PTOE Heath & Associates Subject: Cascade Crest Apartments – Renton Trip Generation Analysis INTRODUCTION This memorandum summarizes the trip generation forecast for the proposed Cascade Crest Apartments development located at the northeast corner of NE 12th Street & Olympia Ave NE in Renton, Washington. PROJECT DESCRIPTION Proposal: The project proposes the construction of two buildings, comprised of up to 22 low-rise apartment dwelling units. Location: The project site, situated on King County tax parcels 092305-9124; 9135, is currently occupied by three single-family dwelling units which will be removed as part of the project. Site Access: Site access is proposed via a single driveway extending south from NE 12th Street. An internal driveway will provide access to the two buildings. Figure 1 on the following page illustrates the vicinity map with the subject parcel highlighted. A conceptual site plan is provided in Figure 2. Cascade Crest Apartments - Renton Trip Generation Analysis 2 HeathTraffic.com Figure 1: Vicinity Map N Subject Site Cascade Crest Apartments - Renton Trip Generation Analysis 3 HeathTraffic.com Figure 2: Conceptual Site Plan N Cascade Crest Apartments - Renton Trip Generation Analysis 4 HeathTraffic.com PROJECT TRIP GENERATION Trip generation forecasts were calculated using the Institute of Transportation Engineers (ITE) Trip Generation Manual, 12th Edition. The project proposes two low- rise buildings containing a total of 22 dwelling units, which is consistent with ITE Land Use Code (LUC) 220 – Multifamily Housing (Low-Rise). Project generated trips were forecast using ITE average rates with dwelling units as the independent variable. Trips associated with the existing single-family dwelling units were incorporated into the trip generation forecast. The project trip generation forecast is summarized in Table 1. Table 1: Project Trip Generation Land Use Units AWDT AM Peak Hour PM Peak Hour In Out Total In Out Total Multifamily Housing (LUC 220) 22 DU 137 2 7 9 7 4 11 Single-Family Detached (LUC 210) -3 DU -27 -1 -1 -2 -2 -1 -3 Net New Trips 110 1 6 7 5 3 8 The project is estimated to generate 110 new average weekday daily trips with 7 new AM peak hour trips (1 entering, 6 exiting) and 8 new PM peak hour trips (5 entering, 3 exiting). CONCLUSION Per the City of Renton’s Policy Guidelines for Traffic Impact Analysis for New Development, a TIA is required for projects generating 20 or more peak hour trips. Based on ITE trip generation data, the Cascade Crest Apartments project is estimated to generate fewer than 10 trips during both the AM and PM peak hours and therefore does not meet the City’s threshold requiring a TIA. Multifamily Housing (Low-Rise) Not Close to Rail Transit (220) Vehicle Trip Ends vs:Dwelling Units On a:Weekday Setting/Location:General Urban/Suburban Number of Studies:28 Avg. Num. of Dwelling Units:208 Directional Distribution:50% entering, 50% exiting Vehicle Trip Generation per Dwelling Unit Average Rate Range of Rates Standard Deviation 6.21 2.46 - 12.50 1.87 Data Plot and Equation T = T r i p E n d s X = Number of Dwelling Units Study Site Average RateFitted Curve Fitted Curve Equation: T = 5.63(X) + 120.45 R²= 0.70 Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 100 200 300 400 5000 1,000 2,000 3,000 9/1/25, 3:55 PM itetripgen.org/query/PrintGraph2?code=220&ivlabel=UNITS220&timeperiod=AWDVTE&x=&edition=806&locationCode=General Urb… Multifamily Housing (Low-Rise) Not Close to Rail Transit (220) Vehicle Trip Ends vs:Dwelling Units On a:Weekday, Peak Hour of Adjacent Street Traffic, One Hour Between 7 and 9 a.m. Setting/Location:General Urban/Suburban Number of Studies:51 Avg. Num. of Dwelling Units:219 Directional Distribution:24% entering, 76% exiting Vehicle Trip Generation per Dwelling Unit Average Rate Range of Rates Standard Deviation 0.41 0.13 - 0.73 0.10 Data Plot and Equation T = T r i p E n d s X = Number of Dwelling Units Study Site Average RateFitted Curve Fitted Curve Equation: T = 0.35(X) + 12.93 R²= 0.81 Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 200 400 6000 100 200 300 9/1/25, 3:56 PM itetripgen.org/query/PrintGraph2?code=220&ivlabel=UNITS220&timeperiod=TASIDE&x=&edition=806&locationCode=General Urba… 1/1 Multifamily Housing (Low-Rise) Not Close to Rail Transit (220) Vehicle Trip Ends vs:Dwelling Units On a:Weekday, Peak Hour of Adjacent Street Traffic, One Hour Between 4 and 6 p.m. Setting/Location:General Urban/Suburban Number of Studies:61 Avg. Num. of Dwelling Units:215 Directional Distribution:62% entering, 38% exiting Vehicle Trip Generation per Dwelling Unit Average Rate Range of Rates Standard Deviation 0.52 0.08 - 1.04 0.13 Data Plot and Equation T = T r i p E n d s X = Number of Dwelling Units Study Site Average RateFitted Curve Fitted Curve Equation: T = 0.48(X) + 7.35 R²= 0.83 Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 200 400 6000 100 200 300 400 9/1/25, 3:56 PM itetripgen.org/query/PrintGraph2?code=220&ivlabel=UNITS220&timeperiod=TPSIDE&x=&edition=806&locationCode=General Urba… Single-Family Detached Housing (210) Vehicle Trip Ends vs:Dwelling Units On a:Weekday Setting/Location:General Urban/Suburban Number of Studies:155 Avg. Num. of Dwelling Units:261 Directional Distribution:50% entering, 50% exiting Vehicle Trip Generation per Dwelling Unit Average Rate Range of Rates Standard Deviation 9.09 3.47 - 23.80 2.29 Data Plot and Equation T = Tri p E n d s X = Number of Dwelling Units Study Site Average RateFitted Curve Fitted Curve Equation: T = 8.07(X) + 265.45 R²= 0.94 Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 500 1,000 1,500 2,000 2,500 3,0000 5,000 10,000 15,000 20,000 Single-Family Detached Housing (210) Vehicle Trip Ends vs:Dwelling Units On a:Weekday, Peak Hour of Adjacent Street Traffic, One Hour Between 7 and 9 a.m. Setting/Location:General Urban/Suburban Number of Studies:153 Avg. Num. of Dwelling Units:239 Directional Distribution:27% entering, 73% exiting Vehicle Trip Generation per Dwelling Unit Average Rate Range of Rates Standard Deviation 0.70 0.22 - 2.27 0.26 Data Plot and Equation T = Tri p E n d s X = Number of Dwelling Units Study Site Average RateFitted Curve Fitted Curve Equation: T = 0.67(X) + 5.59 R²= 0.89 Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 500 1,000 1,500 2,000 2,500 3,0000 500 1,000 1,500 2,000 Single-Family Detached Housing (210) Vehicle Trip Ends vs:Dwelling Units On a:Weekday, Peak Hour of Adjacent Street Traffic, One Hour Between 4 and 6 p.m. Setting/Location:General Urban/Suburban Number of Studies:166 Avg. Num. of Dwelling Units:266 Directional Distribution:62% entering, 38% exiting Vehicle Trip Generation per Dwelling Unit Average Rate Range of Rates Standard Deviation 0.93 0.35 - 2.98 0.33 Data Plot and Equation T = Tri p E n d s X = Number of Dwelling Units Study Site Average RateFitted Curve Fitted Curve Equation: Ln(T) = 0.92 Ln(X) + 0.33 R²= 0.90 Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 500 1,000 1,500 2,000 2,500 3,0000 500 1,000 1,500 2,000 2,500 2-Bed 2-Ba 2-Bed 2-Ba 2-Bed 2-Ba 2-Bed 2-Ba 2-Bed 2-Ba 2-Bed 2-Ba TRASH 35 PARKING STALLS 10 9 5 C 6 7,850 sq. ft. Open Space (7,700 s.f. Reqd.) OL Y M P I A A V E . N . E . N.E. 12th ST. SITE PLAN Cascade Crest Apts. 1" = 30' 20 ' FR O N T Y A R D 20' SECONDARY FRONT YARD 5' SI D E 5' SIDE 15 ' RE A R 5' SIDE 24'20' 24 ' 20 ' 20 ' 11 . 5 ' R. O . W . DE D I C A T I O N 2- B e d 2- B a 2- B e d 2- B a 2- B e d 2- B a 2- B e d 2- B a 2- B e d 2- B a 2- B e d 2- B a 3 2 11 4 . 4 8 ' - Drawn By: Date: Job No.:Sheet No.: Cascade Crest Apts. Renton, WA Bob Wenzl 620 Kirkland Way, Suite 202 Kirkland, WA 98033 ● 425.454.7130 ● WWW.MILBRANDTARCH.COM S1Feasibility Site Plan JLL 1-13-2026 LAND USE:RDH Residential High Density Zoning:RMF Residential Multi-Family Overlay:Urban Design District B APPROX. SITE AREA:.89 ac. (38,940 sq. ft.) (After 11.5' Dedication).83 ac. (36,100 sq. ft.) MAX DENSITY 20 D.U./AC MAX UNITS = .83 x 20 =17 UNITS Affordable units allow density bonus of +30% MAX UNITS WITH AFFORDABLE HOUSING BONUS = 26 D.U./AC or 22 UNITS PROPOSED: TWO 11 UNIT WALK-UP BREEZEWAY BUILDINGS FOR TOTAL OF 22 UNITS. This would be 5 units over standard maximum allowed requiring half of the 5 bonus units to be affordable units. (or 3 affordable units) Proposed units are 2-bed/2-bath units at approx. 1,000 sq. ft. in size PARKING REQUIREMENTS Required parking is 1.4 STALLS / D.U. or 22 x 1.4 = 31 STALLS 10% of provided parking is required for guest parking. 31 Resident stalls + 4 Guest stalls = 35 STALLS MINIMUM. Potential for carports over some or all of surface parking. OPEN SPACE REQUIREMENTS 350 sq. ft. of open space per D.U. = 22 x 350 or 7,700 sq. ft. of open space Provided open space: 7,850 sq. ft. Potentially 3 existing trees could be retained.