A Portland-area bridge ranked eighth in the nation last year on a survey of the nation’s most dangerous accident “hotspots,” according to a study released Friday by a San Francisco-based nonprofit, and it’s likely not the one you’d think.

The Glenn Jackson Bridge on Interstate 205, which spans the Columbia River connecting east Portland and Vancouver, saw at least 124 accidents in 2019.

Go Safe Labs determined that makes the I-205 thoroughfare one of the most accident-prone areas in the country. The nonprofit used data from Bing and Mapquest services to analyze about 1.8 million accidents in 2018 and 2019. Then, researchers compared year-over-year figures to determine if there was significant variance.

The company analyzed the data by geographic area to settle on the nation’s 10 worst spots.

The I-205 bridge ranked just after the George Washington Bridge in New York City as the eighth most dangerous. A Greenville, South Carolina, freeway exit topped the list, tallying 404 accidents.

The company noted it used data from online services like Bing and Mapquest because it is more readily available than official government figures, which Go Safe Labs noted was “the gold standard for accident reporting.”

Researchers cautioned that the data did not “correct for confounding factors such as city area, traffic volume, population, or vehicle miles traveled [VMT]. We also did not account for the severity of accidents, just the volume of accidents occurring. Future work is needed to account for reporting bias and adjust for additional factors,” they wrote.

The I-205 bridge is often overlooked in political discussions, but it is routinely used as a commuting lifeline for many of the estimated 65,000 Washington residents who work in Oregon.

Oregon Department of Transportation officials have frequently called the Rose Quarter area of Interstate 5 the most accident-prone urban freeway in the Portland area and one of the nation’s worst bottlenecks. They also say the project to replace the Interstate Bridge on I-5 would address safety on the Glenn Jackson, the other major bridge spanning the Columbia River.

The Glenn Jackson draws more traffic than the Interstate Bridge, with an estimated 165,000 daily crossings compared to I-5’s 138,000.

Here’s the full list of the accident-prone spots.

-- Andrew Theen; atheen@oregonian.com; 503-294-4026; @andrewtheen

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