Oregon's economy is experiencing nearly unprecedented growth, with the state's jobless rate enjoying a long stretch at a historic low and incomes rising across the state.

But a study out Tuesday from the Oregon Office of Economic Analysis finds the growth has been distributed unequally. Hispanics, African Americans and Native Americans are benefiting far less than other groups, and a significant income divide has emerged in Portland.

"When you layer on multiple issues like housing affordability, displacement, job polarization and the like, you can end up with situations like the following where there has been no real income gains in some neighborhoods within an otherwise thriving regional economy," wrote Josh Lehner, an Oregon state economist.

Drawing on work from Christian Kaylor in the Oregon Employment Department, Lehner found annual household incomes in east Portland (generally east of Southeast 82nd Avenue) are about $45,000 a year – below where they were at the outset of the Great Recession, after adjusting for inflation.

Incomes west of the Willamette River, meanwhile, top $70,000 a year – up about 16 percent since the start of the recession in 2007. (Overall, household incomes across the Portland area are about $66,000 annually.)

Disparities also show up in statewide data, where the median household income is just above $56,000:

Hispanics earn about 80 percent of the median Oregon household.

African Americans and Native Americans both earn about 70 percent of the statewide median.

"The gaps seen in employment and income for Oregon's different racial and ethnic groups do not seem to be widening, but they are also not getting better," Lehner wrote. "Geographic disparities on the other hand have widened this cycle both across and within regions of the state."

-- Mike Rogoway; twitter: @rogoway; 503-294-7699