I haven't seen them, however, I haven't heard of any Republicans challenging them. And Oregon, especially Multnomah County the largest in the State, is highly Democratic.
http://www.oregonlive.com/today/index.ssf/2017/10/democratic_oregon_is_part_of_g.html
Oregon typically isn’t considered one of the states where gerrymandering is a problem. But the state’s 18.9 percent efficiency-gap advantage for the Democrats does give the party one extra congressional seat,
according to Azavea. Some reformers say the efficiency gap should be kept at or below seven percentage points.
Oregon Democrats have four seats in the U.S. House of Representatives to one for the Republicans, which is 80 percent of the congressional seats with 58 percent of the vote.
Oregon has the fourth strongest efficiency-gap state advantage favoring Democrats and ranks 11th overall.
The five states with the strongest partisan efficiency-gap advantage all favor Republicans.