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Historical Markers in Plymouth
Prosser is the county seat for Benton County
Plymouth is in Benton County
Benton County (56) ►
ADJACENT TO BENTON COUNTY Franklin County (26) ►
Grant County (25) ►
Klickitat County (31) ►
Walla Walla County (45) ►
Yakima County (26) ►
Morrow County, Oregon (3) ►
Umatilla County, Oregon (78) ►
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1 ► Washington, Benton County, Plymouth — McNary Dam Tetrahedrons —  |
| During the construction of McNary Dam a total of 3,271 of these 12-ton tetrahedrons were dropped into the Columbia River to complete the closure of the last cofferdam and divert the full flow of the river through the spillway. This method of closure . . . — — Map (db m299769) HM | |||
| 2 ► Washington, Benton County, Plymouth — Strangers "from the clouds" — Reported unreadable |
| "I gave my hand to them all and made signs of my friendly disposition" On October 19, 1805, William Clark and three men traveling ahead of the rest of the party arrived at a Umatilla village near here. Upon seeing Clark, the villagers . . . — — Map (db m158634) HM | |||