Southwest Washington Regional Transportation Council

NW 99th St. / NW 21st Av.

Use the tabs below to select various information provided for this intersection. The first tab offers a map of the intersection location, and a means of locating nearby count locations. Data for each intersection is offered by “leg” which is, at times, not entirely intuitive. Waving your mouse over the names above should clear up any ambiguities. Directional Average Weekday (24 hour average), AM Peak Hour (7-8 a.m.), PM Peak Hour (peak hour between 4-6 p.m.), and PM Peak Turn Movement (right, left, and through), are included in the summary. The final tab provides scanned PDF documents (where available) of the original count data for this intersection.

Aerial Map

 

North Leg Traffic Counts (NW 21st Av.)

Year NB ADT SB ADT ADT NB PM SB PM NB AM SB AM
20180000000
201719941923391720116279179
200321142291440526017864222
200225602384494426816383205
199721901999418926114148178
19900032100000
19881371137727480000
19870026230000
19850032240000

South Leg Traffic Counts (NW 21st Av.)

Year NB ADT SB ADT ADT NB PM SB PM NB AM SB AM
2018131813122630103125162157
20170000000
2003675192726026215543153
200214351502293710511160117
199798110752057861043139
19907798201599838400
198867951411930000
19870013460000
19850014350000

East Leg Traffic Counts (NW 99th St.)

Year EB ADT WB ADT ADT EB PM WB PM EB AM WB AM
20180000000
20170000000
20036079649512575441647448317
20020010595219549182204
199755265485110111005596570144
199039954232822732546000
19883532354070720000
19870062640000
19850054660000

West Leg Traffic Counts (NW 99th St.)

Year EB ADT WB ADT ADT EB PM WB PM EB AM WB AM
20180000000
20170000000
2003371533857100310320262165
2002361137167327285343262169
1997317032516421261324204131
199025682792536122329700
19882443244248850000
19870040880000
19850054770000