This street, which runs about ¼ mile from Lake Washington Boulevard E to the beginning of the Foster Point Trail, all within the Washington Park Arboretum, was without a name until 1968, when it was named for the island in Union Bay to which it led. (It remained unsigned until a few decades later, however. There was no sign at the intersection until at least the 1990s, as I know since my parents’ house was at the south end of the Arboretum and I drove or biked by there weekly, if not more often, while I was growing up.)

Foster Island is known by the Duwamish tribe, who once used it as a burial ground, as Stitici, or ‘little island’. It was named by the settlers for Joel Wellington Foster, who came to Washington in the 1870s from St. Joseph, Missouri. He is said to have donated the island to the city in one HistoryLink article, but another says the city bought it in 1917.

(Note added November 6, 2022: David B. Williams, the “Street Smart Naturalist,” recently posted The Lost Islands of Seattle, in which he wrote that he had seen various sources for the name Foster but none with good documentation. I asked him about the HistoryLink article I cite above:

A screen shot of a tweet by me reading "@geologywriter Re your recent islands newsletter, @HistoryLink says Foster Island was named for Joel Wellington Foster... too anecdotal?" and David B. Williams's reply, "My big problem is that HL has the wrong date for when JWFoster acquired the land. They say early 1900s. Maps show Foster's Island in 1891."

I’m embarrassed to have missed that, but of course he’s right. So if not Joel Wellington Foster, then who? The search continues

[Note: On July 10, 2024, I began converting embedded tweets on this website to screenshots because of issues with how they were integrating with WordPress, which began not too long after Elon Musk purchased Twitter and changed its name to X.]

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