who constructed it?
Stacy and Witbeck
Loop Service
The city selected Stacy and Witbeck to be the project's general contractor and actual construction began the following year.
what is a loop service? A streetcar circle route how was it planned? Plans to expand the Portland Streetcar east of the Willamette River emerged in July 1997 which state is this in? Oregon who were the first inhabitants on the river you just mentioned? The Kalapuya, the Chinook, and the Clackamas did they have any trade? Yes, fur trade which flora can be found here? Black cottonwood, bigleaf maple,  Douglas fir can you please name some animals that live here? Garter snakes, sturgeon, stickleback who are the descendants of those people you mentioned previously? The Atfalati how was the street car route you mentioned previously funded? By federal funds, the city council, local Improvement District, and a combination of various other local or regional sources
wiki:10102403
Loop Service [SEP] Funding and construction
That August, the city signed a $20million contract to purchase six new vehicles from the manufacturer for the eastside extension. Groundbreaking for the Eastside Streetcar Loop project took place on June 25, 2009. The city selected Stacy and Witbeck to be the project's general contractor and actual construction began the following year. Across the alignment, crews laid tracks in three-to-four-block increments; by February 2010, they had been laying tracks on Northeast Grand Avenue. Workers closed the Broadway Bridge to all traffic to be renovated from July 19 to September 3, 2010. To maintain the existing weight of the bridge (this was necessary to allow it to continue lifting its spans) with the addition of tracks, lighter fiber-reinforced concrete replaced the deck.