How much are Oregon's national parks worth to the state's economy? About $114 million, as it turns out.

That's the figure at least from a new study conducted by economists with the U.S. Geological Survey and the National Park Service, who released their 2015 analysis for every state in the U.S. on Thursday.

"The national parks of Oregon attract visitors from across the country and around the world," regional national park director Laura Joss said in a news release. "Visitors come to have a great experience, and end up spending a little money along the way."

Most of the $114.7 million came from "secondary effects," according to the study, which made up 43.5 percent of the total economic output. That includes money spent locally that is related to, but not directly caused by, tourism spending at the park sites.

The direct spending went primarily to hotels, which made up 16.4 percent of the impact, and restaurants, which made up 10.7 percent. Recreation, transportation, shopping, camping, fuel and groceries rounded out the rest.

The money was spent at national park sites around the state, which include Crater Lake, John Day Fossil Beds and the Oregon Caves, as well as parts of Fort Vancouver, and Nez Perce and Lewis and Clark National Historical Parks.

Oregon's figure is an increase from years past, but it's still a far cry from the economic impact of national parks in neighboring Washington and California, which brought in $630 million and $2.6 billion respectively. Idaho came in last among Cascadian states, with $36 million in economic benefit.

It's all a part of the $32 billion injected into the full U.S. economy from national parks, according to the study, nearly $3 billion more than the estimated impact in 2014.

"This new report shows that national park tourism is a significant driver in the national economy - returning $10 for every $1 invested in the National Park Service," Joss said. "And a big factor in the state's economy as well."

The 2015 economic impact of national park tourism in Oregon.

--Jamie Hale | jhale@oregonian.com | @HaleJamesB