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Home My WebLink AboutYelm Crossing - Traffic ScopingHeathTraffic.com Yelm Crossing Scoping Memo 1 October 22, 2025 The City of Yelm TIA Scoping Memo The intent of this assessment is to provide Yelm with a trip generation summary, site characteristics, and study parameters for the proposed project herein referred to as Yelm Crossing. A project description is provided below. 1. PROJECT DESCRIPTION • Yelm Crossing is a proposed mixed-use development located within the City of Yelm. The specific building uses and sizes are currently undetermined and may change as the project advances. However, the assumed tenants are generally consistent with the planned occupants and reflect higher trip-generating uses than what may ultimately occur.  Pad 1: 5,100 sf High-Volumes Fast-Food Restaurant  Pad 2: 2,565 sf Fast-Food Restaurant With DT  Pad 3: 2,565 sf Coffee Shop with DT & Indoor Seating  Pad 4: 3,125 sf Fast-Food Restaurant With DT  Pad 5: 3,125 sf Car Wash (Single Automated Tunnel) • The subject site is bordered to the south via SR 507 and to the east by Walmart Boulevard SE situated on 7.1-acres within undeveloped tax parcel number 64303100900. • Site ingress/egress is proposed via two access points. i) One existing access which extends north from SR 507 and currently serves tax parcel 64303100800, and is proposed to be right-in, right-out only. ii) One new full movement access which is proposed to extend west from Walmart Boulevard SE. • A vicinity map of the surrounding roadway network is provided on the following page with the subject site highlighted in red. HeathTraffic.com Yelm Crossing Scoping Memo 2 Figure 1: Vicinity Map Subject Site N SR 507 N SITE PLAN FIGURE 2 YELM CROSSING 3 HeathTraffic.com Yelm Crossing Scoping Memo 4 2. FORECAST TRAFFIC DEMAND & ANALYSIS 2.1 Project Trip Generation Trip generation for the proposed project was derived from the Institute of Transportation Engineers (ITE) publication, Trip Generation, 12th Edition. The Land Use Codes (LUC) selected for this project are described below. All uses have utilized square footage as the input variable with ITE’s average rates to determine trip ends.  Pad 1 – LUC 929 – High-Volume Fast-Food Restaurant  Pad 2 – LUC 934 – Fast-Food Restaurant With DT  Pad 3 – LUC 937 – Coffee Shop with DT & Indoor Seating  Pad 4 – LUC 934 – Fast-Food Restaurant With DT  Pad 5 – LUC 948 – Automated Car Wash Note that the above represents a conservative tenant mix. Actual tenants may vary, and trip generation estimates are subject to change based on the final tenant uses. Trip Adjustments: Pass-by trips are defined as trips which make an intermediate stop at a site along their existing route between a primary origin and destination. Pass-by trips impact site driveways but do not represent new trips on the surrounding street network. Pass-by rates for each land use were obtained from the Trip Generation Manual 2025 pass-by tables are shown below.  Pads1 1, 2, and 4 – Daily: 52.5%, AM: 50%, PM: 55%  Pad 3 – Daily: 82%, AM: 83%, PM: 81%  Pad 42 – Daily: 50%, AM: 50%, PM: 50% Refer to Table 1 on the following page for the estimated project generated trips. Refer to the appendix for the trip generation breakdown by use. 1 LUC 929 utilized pass-by rates for LUC 934 given the similar nature of the use. 2 Pass-by rates for car washes vary for different jurisdictions. The City of Fife allows a 50% reduction. Bothell uses a 42% pass-by rate; and the City of Richland allows a 67% pass-by rate. We have used 50% here. HeathTraffic.com Yelm Crossing Scoping Memo 5 Table 1: Project Trip Generation Land Use KSF Trip Type AWDT AM Peak-Hour Trips PM Peak-Hour Trips In Out Total In Out Total Pad 1 LUC 929 5.1 Total Less Pass-By Primary 3,331 -1,749 1,582 69 -33 36 64 -33 31 133 -66 67 149 -82 67 149 -82 67 298 -164 134 Pad 2 LUC 934 2.565 Total Less Pass-By Primary 1,149 -603 546 43 -21 22 42 -22 20 85 -43 42 42 -23 19 39 -22 17 81 -45 36 Pad 3 LUC 937 2.565 Total Less Pass-By Primary 1,540 -1,263 277 112 -91 21 107 -91 16 219 -182 37 50 -40 10 50 -41 9 100 -81 19 Pad 4 LUC 934 3.125 Total Less Pass-By Primary 1,400 -735 665 53 -26 27 51 -26 25 104 -52 52 52 -27 25 47 -27 20 99 -54 45 Pad 5 LUC 948 3.125 Total Less Pass-By Primary 792 -396 396 26 -12 14 21 -11 10 47 -23 24 37 -19 18 39 -19 20 76 -38 38 Total Pass-By Trips 4,746 183 183 366 191 191 382 Total Primary Trips 3,466 120 102 222 139 133 272 Based on ITE data, the project is anticipated to generate 1,306 average weekday daily trips with 82 AM peak hour trips (20 inbound / 62 outbound) and 103 PM peak hour trips (65 inbound / 38 outbound). The trip generation outputs have been included in the appendix for reference. 2.2 Distribution & Assignment Trip distribution for this project is generally consistent with TAZ 1089, provided by Thurston Regional Planning Council. This assumes completion of the roundabout at SR 507/Walmart Avenue (future SR 510 bypass) and completion of the SR 510 bypass route. Consequently, pass-by trips were assigned to both the north-south and east- west directions. Figure 3 illustrates the initial trip assignments. PM PEAK HOUR TRIP DISTRIBUTION & ASSIGNMENT FIGURE 3 YELM CROSSING N SITE 31 9 100 0 32 0 0 0 0 0 0 00 5 4 6 4 S T O P 0 0 0 0 0 S T O P 0 0 0 64(57) 0000 13(15) 54(-15) 0 00 (-57) 26(28) 27(29) 39(72) 64(86) 14(29) (-29) 13(29) (-29) ST O P 5 0 0 0 0 ST O P 5 PM PEAK HOUR PRIMARY TRIPS INBOUND: 139 VPH OUTBOUND: 133 VPH PM PEAK HOUR PASS-BY TRIPS INBOUND: (191) VPH OUTBOUND: (191) VPH 10% 48%38% 23% 4% 3% 4% (-61)53 51(76) 81(90)STOP PASS-BY 40% PASS-BY 30% PASS-BY 15% PASS-BY 15% 6 HeathTraffic.com Yelm Crossing Scoping Memo 7 3. CONCLUSION Yelm Crossings is a proposed commercial development planned with five pads of various uses. Based on a conservative tenant assumption of higher-generating uses, the project is estimated to generate a net increase of 272 PM peak hour trips. The proposed access to SR 507 will be combined with an existing commercial approach and will be converted to right-in, right-out. A full access will be available on the future SR 510 Bypass Loop Road. If a full Traffic Impact Analysis (TIA) is required, please provide a list of the study intersections, pipeline, and other general requirements. Thank you, Aaron Van Aken, P.E. PTOE HeathTraffic.com Yelm Crossing Scoping Memo 8 YELM CROSSING SCOPING MEMO APPENDIX High-Volume Fast-Food Restaurant (929) Vehicle Trip Ends vs:1000 Sq. Ft. GFA On a:Weekday Setting/Location:General Urban/Suburban Number of Studies:7 Avg. 1000 Sq. Ft. GFA:5 Directional Distribution:50% entering, 50% exiting Vehicle Trip Generation per 1000 Sq. Ft. GFA Average Rate Range of Rates Standard Deviation 653.22 453.05 - 1045.83 209.04 Data Plot and Equation T = T r i p E n d s X = 1000 Sq. Ft. GFA Study Site Average Rate Fitted Curve Equation: Not Given R²= **** Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 1 2 3 4 5 60 1,000 2,000 3,000 4,000 5,000 Yelm Crossing Scoping Memo 9 High-Volume Fast-Food Restaurant (929) Vehicle Trip Ends vs:1000 Sq. Ft. GFA 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:21 Avg. 1000 Sq. Ft. GFA:5 Directional Distribution:52% entering, 48% exiting Vehicle Trip Generation per 1000 Sq. Ft. GFA Average Rate Range of Rates Standard Deviation 26.02 6.80 - 49.37 13.38 Data Plot and Equation T = T r i p E n d s X = 1000 Sq. Ft. GFA Study Site Average Rate Fitted Curve Equation: Not Given R²= **** Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 1 2 3 4 5 60 100 200 300 Yelm Crossing Scoping Memo 10 High-Volume Fast-Food Restaurant (929) Vehicle Trip Ends vs:1000 Sq. Ft. GFA 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:21 Avg. 1000 Sq. Ft. GFA:5 Directional Distribution:50% entering, 50% exiting Vehicle Trip Generation per 1000 Sq. Ft. GFA Average Rate Range of Rates Standard Deviation 58.43 30.97 - 96.93 15.13 Data Plot and Equation T = T r i p E n d s X = 1000 Sq. Ft. GFA Study Site Average Rate Fitted Curve Equation: Not Given R²= **** Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 1 2 3 4 5 60 100 200 300 400 500 Yelm Crossing Scoping Memo 11 Yelm Crossing Scoping Memo 12 Yelm Crossing Scoping Memo 13 Yelm Crossing Scoping Memo 14 Coffee/Donut Shop with Drive-Through Window (937) Vehicle Trip Ends vs:1000 Sq. Ft. GFA On a:Weekday Setting/Location:General Urban/Suburban Number of Studies:8 Avg. 1000 Sq. Ft. GFA:2 Directional Distribution:50% entering, 50% exiting Vehicle Trip Generation per 1000 Sq. Ft. GFA Average Rate Range of Rates Standard Deviation 600.50 309.41 - 1085.78 277.14 Data Plot and Equation T = T r i p E n d s X = 1000 Sq. Ft. GFA Study Site Average Rate Fitted Curve Equation: Not Given R²= **** Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 0.5 1.0 1.5 2.0 2.5 3.00 500 1,000 1,500 2,000 9/10/25, 10:35 AM itetripgen.org/query/PrintGraph2?code=937&ivlabel=QFQAF&timeperiod=AWDVTE&x=&edition=806&locationCode=General Urba… https://www.itetripgen.org/query/PrintGraph2?code=937&ivlabel=QFQAF&timeperiod=AWDVTE&x=&edition=806&locationCode=General Urban/Subur…1/1 Yelm Crossing Scoping Memo 15 Coffee/Donut Shop with Drive-Through Window (937) Vehicle Trip Ends vs:1000 Sq. Ft. GFA 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:84 Avg. 1000 Sq. Ft. GFA:2 Directional Distribution:51% entering, 49% exiting Vehicle Trip Generation per 1000 Sq. Ft. GFA Average Rate Range of Rates Standard Deviation 85.41 18.51 - 282.05 44.24 Data Plot and Equation T = T r i p E n d s X = 1000 Sq. Ft. GFA Study Site Average Rate Fitted Curve Equation: Not Given R²= **** Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 1 2 3 4 5 60 100 200 300 400 500 9/10/25, 10:36 AM itetripgen.org/query/PrintGraph2?code=937&ivlabel=QFQAF&timeperiod=TASIDE&x=&edition=806&locationCode=General Urban… https://www.itetripgen.org/query/PrintGraph2?code=937&ivlabel=QFQAF&timeperiod=TASIDE&x=&edition=806&locationCode=General Urban/Suburb…1/1 Yelm Crossing Scoping Memo 16 Coffee/Donut Shop with Drive-Through Window (937) Vehicle Trip Ends vs:1000 Sq. Ft. GFA 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:41 Avg. 1000 Sq. Ft. GFA:2 Directional Distribution:50% entering, 50% exiting Vehicle Trip Generation per 1000 Sq. Ft. GFA Average Rate Range of Rates Standard Deviation 39.00 13.78 - 92.31 17.60 Data Plot and Equation T = T r i p E n d s X = 1000 Sq. Ft. GFA Study Site Average Rate Fitted Curve Equation: Not Given R²= **** Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 1 2 3 4 5 60 100 200 300 9/10/25, 10:36 AM itetripgen.org/query/PrintGraph2?code=937&ivlabel=QFQAF&timeperiod=TPSIDE&x=&edition=806&locationCode=General Urban… https://www.itetripgen.org/query/PrintGraph2?code=937&ivlabel=QFQAF&timeperiod=TPSIDE&x=&edition=806&locationCode=General Urban/Suburb…1/1 Yelm Crossing Scoping Memo 17 Automated Car Wash (948) Vehicle Trip Ends vs:1000 Sq. Ft. GFA On a:Weekday Setting/Location:General Urban/Suburban Number of Studies:14 Avg. 1000 Sq. Ft. GFA:5 Directional Distribution:50% entering, 50% exiting Vehicle Trip Generation per 1000 Sq. Ft. GFA Average Rate Range of Rates Standard Deviation 253.51 33.68 - 562.06 163.78 Data Plot and Equation T = T r i p E n d s X = 1000 Sq. Ft. GFA Study Site Average Rate Fitted Curve Equation: Not Given R²= **** Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 2 4 60 500 1,000 1,500 2,000 2,500 8/20/25, 1:09 PM itetripgen.org/query/PrintGraph2?code=948&ivlabel=QFQAF&timeperiod=AWDVTE&x=&edition=806&locationCode=General Urba… https://www.itetripgen.org/query/PrintGraph2?code=948&ivlabel=QFQAF&timeperiod=AWDVTE&x=&edition=806&locationCode=General Urban/Subur…1/1 Yelm Crossing Scoping Memo 18 Automated Car Wash (948) Vehicle Trip Ends vs:1000 Sq. Ft. GFA 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:14 Avg. 1000 Sq. Ft. GFA:5 Directional Distribution:55% entering, 45% exiting Vehicle Trip Generation per 1000 Sq. Ft. GFA Average Rate Range of Rates Standard Deviation 14.89 3.16 - 34.71 9.20 Data Plot and Equation T = T r i p E n d s X = 1000 Sq. Ft. GFA Study Site Average Rate Fitted Curve Equation: Not Given R²= **** Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 2 4 60 50 100 150 200 8/20/25, 1:16 PM itetripgen.org/query/PrintGraph2?code=948&ivlabel=QFQAF&timeperiod=TASIDE&x=&edition=806&locationCode=General Urban/… https://www.itetripgen.org/query/PrintGraph2?code=948&ivlabel=QFQAF&timeperiod=TASIDE&x=&edition=806&locationCode=General Urban/Suburb…1/1 Yelm Crossing Scoping Memo 19 Automated Car Wash (948) Vehicle Trip Ends vs:1000 Sq. Ft. GFA 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:15 Avg. 1000 Sq. Ft. GFA:4 Directional Distribution:49% entering, 51% exiting Vehicle Trip Generation per 1000 Sq. Ft. GFA Average Rate Range of Rates Standard Deviation 24.40 3.16 - 48.62 14.47 Data Plot and Equation T = T r i p E n d s X = 1000 Sq. Ft. GFA Study Site Average Rate Fitted Curve Equation: Not Given R²= **** Trip Gen Manual,12th Edition Institute of Transportation Engineers 0 2 4 60 100 200 300 8/20/25, 1:16 PM itetripgen.org/query/PrintGraph2?code=948&ivlabel=QFQAF&timeperiod=TPSIDE&x=&edition=806&locationCode=General Urban/… https://www.itetripgen.org/query/PrintGraph2?code=948&ivlabel=QFQAF&timeperiod=TPSIDE&x=&edition=806&locationCode=General Urban/Suburb…1/1 Yelm Crossing Scoping Memo 20 Heath & Associates Transportation Engineering Project: Yelm Crossing Jurisdiction: City of Yelm In Out In Out Total In Out Total % Total In Out Total 1733.5 1733.5 3466.9 In Out In Out Total In Out Total % Total In Out Total 114.5 106.9 221.4 In Out In Out Total In Out Total % Total In Out Total 137.3 134.8 272.1 38.1 Net New Primary Trips 38.9 76.3 0.0 0.0 0.0 50% 38.1 18.7 19.4PAD 5 Automated Car Wash 948 KSF 3.125 24.4 49% 51% 37.4 19.0 PAD 4 FF With DT 934 KSF 3.125 31.6 52% 48% 51.4 47.4 98.8 0.0 0.0 0.0 55% 54.3 23.1 21.3 44.4 50.0 100.0 0.0 0.0 0.0 81% 81.0 9.5 9.5PAD 3 Coffee Shop with DT & Seating 937 KSF 2.565 39 50% 50% 50.0 134.1 PAD 2 FF With DT 934 KSF 2.565 31.6 52% 48% 42.1 38.9 81.1 0.0 0.0 0.0 55% 44.6 19.0 17.5 36.5 149.0 298.0 0.0 0.0 0.0 55% 163.9 67.0 67.0PAD 1 High Volume FF Rest.929 KSF 5.1 58.43 50% 50% 149.0 Net New Primary Trips PM Peak Hour Development Land Use LUC Variable Value Rate Distribution Total Trips Internal Capture Pass-by Trips Primary Trips 25.4 51.9 PAD 5 Automated Car Wash 948 KSF 3.125 14.89 55% 45% 25.6 20.9 46.5 0.0 0.0 0.0 50% 23.3 12.8 10.5 23.3 0.0 0.0 83% 181.8 19.0 18.2 37.2 PAD 4 FF With DT 934 KSF 3.125 33.24 51% 49% 53.0 50.9 103.9 0.0 0.0 0.0 50% 51.9 26.5 66.4 PAD 2 FF With DT 934 KSF 2.565 33.24 51% 49% 43.5 41.8 85.3 0.0 0.0 0.0 50% 42.6 21.7 20.9 42.6 63.7 132.7 0.0 0.0 0.0 50% 66.4 34.5 31.8PAD 1 High Volume FF Rest.929 KSF 5.1 26.02 52% 48% 69.0 396.1 198.1 198.1 396.1 PAD 1 PAD 2 PAD 3 PAD 4 50% 50% 396.1 396.1 792.2 0.0 0.0 0.0 50.0% 1400.4 0.0 0.0 0.0 52.5% 735.2 332.6 332.6 665.2FF With DT 934 KSF 3.125 448.12 50% 50% 700.2 700.2 1540.3 0.0 0.0 0.0 82.0% 1263.0 138.6 138.6 277.3 Coffee Shop with DT & Seating 937 KSF 2.565 600.5 50% 50% 770.1 770.1 0.0 0.0 52.5% PAD 5 Automated Car Wash 948 KSF 3.125 253.51 1749.0 1149.4 0.0 52.5%0.0 603.4 Land Use LUC Variable 929High Volume FF Rest. FF With DT Internal Capture 934 KSF 2.565 Pass-by Trips Yelm Crossing - Trip Generation Summary 546.0 0.0 448.12 50% 50% 574.7 574.7 50%50%653.225.1KSF 1665.7 1665.7 3331.4 0.0 Rate DistributionValueDevelopment Average Weekday Trips Total Trips Primary Trips Net New Primary Trips 791.2 791.2 1582.4 273.0 273.0 AM Peak Hour Development Land Use LUC Variable Value Rate Distribution Total Trips Internal Capture Pass-by Trips Primary Trips PAD 3 Coffee Shop with DT & Seating 937 KSF 2.565 85.41 51% 49% 111.7 107.3 219.1 0.0 Yelm Crossing Scoping Memo 21 Yelm Crossing Scoping Memo 22 SR 507 SE SR 5 1 0 F U T U R E L O O P DR I V E - T H R U WA I T I N G DRIVE THRU STOP DRIVE THRU SL O P E SL O P E ST O R A G E SLOPESLOPE RE : K I T C H E N FO R S H E L V I N G IN T H I S A R E A Yelm Crossing Scoping Memo 23