Southwest Washington Regional Transportation Council

Fourth Plain Bl. / NE 121st 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 (NE 121st Av.)

Year NB ADT SB ADT ADT NB PM SB PM NB AM SB AM
2021425035127762419314245250
2015356943757944396374169159
2011423940618300345349151167
2000262925905219223227138141
19960000000
19932251124134922571256621
1992997148224791321352734
199110849772061133982614
19901946198539302232304820
19880000000
19870009810200
19860000000
19820000000

South Leg Traffic Counts (NE 121st Av.)

Year NB ADT SB ADT ADT NB PM SB PM NB AM SB AM
20214718537110089452438307326
2015468952829971478515342312
2011419749459143397415261285
2000355540077562324357235214
1996256229165478224279152148
19931337206734049916153108
19921112146025721001515874
1991118915532742981438392
19901331154128721101457073
19887351402213725913400
198700010514400
19860022260000
1982007200000

East Leg Traffic Counts (Fourth Plain Bl.)

Year EB ADT WB ADT ADT EB PM WB PM EB AM WB AM
202117394151293252314518688441032
201515120152143033413799704801113
2011176841764035324176411645991443
2000186381926937907190911786421639
1996162861672333010186211104941563
199301659000112001466
199211818118252364214879253951207
199111407114522285913978874131194
199011252121142336613409153701170
19880000000
1987000115172200
19860000000
19820000000

West Leg Traffic Counts (Fourth Plain Bl.)

Year EB ADT WB ADT ADT EB PM WB PM EB AM WB AM
20211959219895394871486131510471509
2015174671604633513136711158791212
2011165721630132873122010406701142
20000000000
1996182761779536071206011645691604
19930000000
199212027117902381615019064211136
19910000000
199013210118272503614708787501160
1988106531073321386115192100
1987000115769300
19860000000
19820000000