An environmental advocacy group placed rivers from Maine to Oregon on its list of most-endangered waterways in a report Wednesday that concludes they are threatened by potential overuse and in some cases persistent drought.

American Rivers put the Catawba-Wateree River in South and North Carolina No. 1 on its top 10 list for 2008.

Maine’s Allagash Wilderness Waterway was listed No. 8. The organization chooses from nominations made by environmental and river advocacy groups and bases the selections on the significance of a river as a resource, the level of the threat, and pending decisions that could affect the river in the next year, said Rebecca Wodder, president of the Washington-based American Rivers.

The Allagash Wilderness Waterway flows for 92 miles through the commercial forests of northwestern Maine. In 1970, the Allagash became the first state-administered waterway within the National Wild and Scenic Rivers program.

But the Allagash has been the center of numerous, high-profile legal and legislative battles between conservation groups wanting to maximize the “wilderness character” of the waterway and St. John Valley residents who want access to the river for day use.

Tensions culminated in 2006 with a controversial state law that effectively guaranteed a list of vehicle access points to the river and designated six bridges within the waterway as permanent structures.

Those changes were among the reasons given by American Rivers for adding the Allagash to the 2008 list of endangered rivers.

On the Allagash, the issue is “excessive motor vehicle access and development,” American Rivers said in a news release. “Originally, only two drive-up access points were authorized. Over the years, another 10 vehicular access sites have been created. That has caused conflicts when short-term users try to outcompete wilderness paddlers for campsites.”

“Politicians often flip-flop on issues,” Wodder said in a statement. “But to flip-flop by reversing protections for the Allagash on the 40th anniversary of the Wild and Scenic Rivers Act is particularly unfortunate.”

The most-threatened rivers this year are endangered by proposed construction projects, outdated management plans and faulty ideas to pull water from them, the report said.

“There is plenty of water to go around if we use it wisely,” Wodder said.

“People across America should look at what’s happening on the Catawba-Wateree as a preview of coming attractions, and this movie isn’t a comedy, it’s a horror film,” Wodder said.

The designation is the latest bit of bad news for the 300-mile Catawba-Wateree river, which also is the focus of a legal fight between the Carolinas that’s made its way to the U.S. Supreme Court. That debate is under way in the Carolinas, where two growing suburbs of Charlotte, N.C., want to pull millions of gallons from the river before it flows south to the state line near where its name changes to the Wateree. The river already provides drinking water to 1.3 million people and electricity to at least a million people, according to Charlotte-based Duke Energy Corp., which owns and operates the river’s reservoirs and power plants.

BDN writer Kevin Miller

contributed to this report.

Most endangered rivers

The country’s most endangered rivers, according to Washington-based advocacy group American Rivers:

1. Catawba-Wateree River (N.C., S.C.)

2. Rogue River (Ore.)

3. Cache la Poudre River (Colo.)

4. St. Lawrence River (N.Y., Canada)

5. Minnesota River (S.D., Minn.)

6. St. John River (Fla.)

7. Gila River (N.M., Ariz.)

8. Allagash Wilderness Waterway (Maine)

9. Pearl River (Miss., La.)

10. Niobrara River (Wyo., Neb.)

Source: American Rivers