Kenai Peninsula leads statewide elodea fight

Although elodea wasn’t discovered on the Kenai Peninsula until 2012, the peninsula is at the forefront of eradicating it.

The invasive aquatic plant was discovered in Beck Lake, Daniels Lake and Stormy Lake, all in Nikiski. The U.S. Fish and Wildlife Service slammed the brakes on activity in the lakes to prevent further spread, which has so far been successful, according to Kenai National Wildlife Refuge Supervisory Biologist Dr. John Morton — the department has not found the plant anywhere else on the peninsula.

Today, the lakes are essentially clear. The department is still conducting some spot treatments and Stormy Lake will remain closed to the retention of Dolly Varden and Arctic char throughout the winter, but they hope to have the boat launch open again by spring, Morton said in a presentation to the Kenai Peninsula Borough Assembly Tuesday.

“To the best of our knowledge, it only occurred in the three lakes north of Nikiski,” Morton said. “Our main concern is that it doesn’t occur in any of the three lakes. We’re continuing to work with other areas in the state in hopes that they will catch up.”

That is not the case elsewhere in Alaska. Anchorage is still treating elodea in its lakes and the plant was recently discovered in Lake Hood, which is the site of one of the world’s busiest floatplane bases. Cordova still has elodea in several of its lakes and the infestations near Fairbanks are currently being treated.

Elodea doesn’t need much plant material to spread — even a sprig can quickly invade a lake, Morton said. The Fish and Wildlife Service wanted to treat the lake quickly to prevent the planes from inadvertently spreading elodea to other bodies of water in Alaska, he said, but the permitting process through the Alaska Department of Environmental Conservation can take up to 100 days.

Part of that is the department being cautious about spreading chemicals into the environment, but it can delay treatment, he said.

“If you apply in the spring, you’re lucky if you can start treatment by the fall,” Morton said.

However, the borough’s financial aid to the Fish and Wildlife Service has been able to help with the Lake Hood treatment. The Department of Environmental Conservation made a one-time permit exception for the treatment of Lake Hood, and the Fish and Wildlife Service was able to use some of the funds to purchase the chemicals to treat the lake, Morton said.

Without the funds from the borough, the department would have had to apply for National Environmental Policy Act funds, which can take months to be approved.

Unlike indigenous plants, elodea photosynthesizes throughout the winter, even beneath the ice, which allows it to spread quickly, he said. The Fish and Wildlife Service used a tactic of loading the lakes with fluridone, an herbicide that interferes with photosynthesis and kills the plants gradually.

This allows them to die and disintegrate, while the alternative would be to shock the lake and kill everything in it, including the fish. The biologists then maintain the fluridone at levels lethal to elodea in the water column for weeks at a time, monitoring the chemical level constantly, Morton said.

Fluridone is a fairly expensive chemical — the effort to fight elodea in the three lakes on the peninsula ran up a total bill of approximately $660,000, Morton said. However, it is the most effective long-term solution and poses no risk to humans, making it safer for settled areas, he said.

This tactic is being used in the Tanana River Watershed area in the interior, where elodea was discovered in September. Heather Stewart, a natural resource specialist for the Alaska Department of Natural Resources, said the department is not sure how elodea spreads in individual cases, but there are a number of risks.

“I can’t point the finger, as much as I’d like to, because it would make our lives easier,” Stewart said. “We see a lot of fragmenting (of the plant). We think that if we can get these sites at an early part of their establishment, it has less time for that natural dispersion.”

To date, the state has spent nothing on fighting elodea — all of the funds have been provided through the U.S. Fish and Wildlife Service, the U.S. Forest Service, the Kenai Peninsula Borough and other smaller sources, Stewart said. Because Lake Hood is a commercially operating floatplane base, they were able to use the airport plant funds to treat the base.

However, the cost of fighting it in Cordova’s Eyak Lak and other infested bodies of water could range up to $1 million, making it hard to find the funds, Stewart said. On top of that, the Department of Natural Resources does some surveying, but it is difficult to determine where else elodea could be growing in the state, she said.

“I’m pretty sure that we’re also on our way for eradication (in Anchorage) as long as we keep up with the surveys” Stewart said. “That’s kind of the caveat to what we’re dealing with. We have a snapshot of where we think it is, but there’s huge areas that haven’t been surveyed.”


Reach Elizabeth Earl at

More in News

The Homer Spit stretching into Kachemak Bay is seen here on Thursday, Dec. 10, 2020 in Homer, Alaska. (Photo by Megan Pacer/Homer News)
Homer woman indicted over seaplane incident

Marian Tillion Beck was indicted on charges of negligent operation of a vessel and attempted interference with the navigation of a sea plane

Soldotna High School can be seen in this Sept. 2, 2021, photo, in Soldotna, Alaska. (Photo by Jeff Helminiak/Peninsula Clarion file)
‘Little Sweethearts’ family dance to debut at SoHi

The event will be hosted by SoHi’s freshmen student council

Soldotna City Council members interview city manager applicant Elke Doom (on screen) during a special city council meeting on Monday, Jan. 30, 2023. (Ashlyn O’Hara/Peninsula Clarion)
Doom, Bower named finalists for Soldotna manager gig

The two will visit Soldotna for in-person meetings on Feb. 7 and 13, respectively

The northern fur seal rescued by Alaska SeaLife Center staff is seen on Jan. 31, 2023, at the Alaska SeaLife Center in Seward, Alaska. (Photo courtesy Kaiti Grant/Alaska SeaLife Center)
Northern fur seal pup admitted to SeaLife Center rescue program

The pup was reported by Sitka residents using the center’s 24-hour stranding hotline

The Kenai Community Library children’s section is seen on Tuesday, Oct. 26, 2021. (Camille Botello/Peninsula Clarion)
Literary competition returns to local schools

Battle of the Books aims to instill in kids a love of reading

Clarise Larson / Juneau Empire
Climate activists hold a rally outside the Alaska State Capitol Friday afternoon in advocacy for legislative action to improve Alaska’s renewable energy development and future sustainability.
Climate activists hold rally near the Capitol

Statewide organizations advocate for legislative action

Shanon Davis, the executive director of the Soldotna Chamber of Commerce, hands out candy during the Sweeny’s St. Patrick’s Parade in Soldotna on March 17, 2022. (Camille Botello/Peninsula Clarion)
Davis to step down as Soldotna chamber head

Davis oversaw the implementation of Soldotna’s “Holding Our Own,” shop local program

Golden-yellow birch trees and spruce frame a view of Aurora Lagoon and Portlock Glacier from a trail in the Cottonwood-Eastland Unit of Kachemak Bay State Park off East End Road on Sunday, Oct. 3, 2021, near Homer, Alaska. (Photo by Michael Armstrong)
State parks advisory boards accepting applications

Alaska State Park advisory boards provide state park managers with recommendations on management issues

Most Read