While it is a small transit agency, Twin Transit operates an adequate service for the small communities it serves. There are several bus routes that connect various points in Chehalis and Centralia, plus a "museum express" route that serves the area of Chehalis where the Chehalis - Centralia Steam Train Association has its steam train excursions, plus the Veterans Museum.
The service is centered around the Centralia Amtrak station, where many of the routes originate and terminate.
Unfortunately, right now the web site for the transit agency is out of service.
As the transit agency is headquartered and centered around Centralia, much of the information I have about this service is located in my Centralia page. Therefore, please see my Twin Transit Tip located in my Centralia page.
By far the least expensive way to get to Chehalis from the south is by public transit bus. This service is operated by the Lower Columbia Community Action Program. Buses operate between the Vancouver, Washington Salmon Creek Park and Ride lot, Woodland Park and Ride, Longview Transit Center, Kalama, Castle Rock Park and Ride, the Exit 63 Shell Station, and the Wal-Mart in Chehalis.
Unfortunately, the Wal-Mart parking lot in Chehalis isn't the most convenient place from which to get to the rest of town, and you would either have to walk a fair distance along roads that really are not intended for walking, or take Twin Transit.
Fares are $1 per boarding.
On weekdays, the buses stop at the Chehalis Wal-Mart several times a day, and this is as far north as they go. The earliest arrival from Longview is 8:05 am, and the earliest arrival from the Vancouver area is 9:05 am. The last trip going back south is 4:05 pm, which will get you to either Longview or Castle Rock. The Saturday schedule is very limited, and there is no service on Sundays.
The program is an extensive rural social services organization, and the bus service is only part of a fairly extensive web site. Currently, the way to find out about their services is to select Community Services from the menu on the left side of the page, and then select transportation.
These are small vans and therefore seating is limited. However, according to the web site they are equipped with bike racks for those wishing to explore the areas beyond the bus routes by bike.
Driving-Interstate 5 about halfway between Seattle and Portland///
Train-Twin Transit Bus from Centralia (Amtrak) train depot///
Bus-Twin Transit Bus from Centralia Greyhound stop (Mellen Street Texaco Station)
You could walk everywhere if you had a few hours or you can take the bus. Driving is also allowed.