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9A THE DAILY ASTORIAN • THURSDAY, AUGUST 25, 2016 Jetty: ‘Our intent is to not come back out here for 50 years’ Continued from Page 1A Project managers estimate the repairs to Jetty A will be completed in June 2017. Ilwaco res- idents and state park visitors will notice some construction trafic due to the project, but barg- ing the rocks in has reduced that trafic signii- cantly compared to past projects that relied on trucks to move all the rock. The barge is also more cost-effective, project oficials said. Scope of the repairs From above, it’s easy to spot several dips, gaps and holes in the jetty’s exterior that show how the elements have battered it over the years. What’s not as easy to see is the almost 900 feet of rock that is now mostly submerged. In fact, boats that try to cut the corner outside the navigation buoy, risk striking the rocks. According to Jerry Otto, a Corps civil engi- neer and the Jetty A project manager, not all of that will be rebuilt. He said scientiic modeling now gives engineers “a more precise muscle,” so that less material can be used to make jetties more eficient structures. That modeling shows workers will need to add just an additional 200 feet to bring the jetty up to full functional capacity. A massive fortii- cation of rocks at the tip of the jetty should pre- vent any future loss of length. Currently, workers are focusing repairs to the most degraded sections of the jetty. Photos by David Plechl/EO Media Group Kiewit construction workers offloaded nearly 14,000 tons of stone from a barge at the tip of Jetty A as part of a construction and rebuilding effort that will last through next summer. The jetty system supports safe ship travel through the mouth Columbia River and neighboring navigation channels. Arming the jetty Crews were working around the clock to unload the shipments of basalt, a type of vol- canic rock that is known for its durability and strength. Each boulder weighs somewhere between 6 and 28 tons, and each barge carries about 13,000 to 14,000 tons of stone, project oficials said. In all, work crews will add about 82,000 tons of rock to the jetty. A “spotter,” perched below the crane, exam- ined the shape of each stone, and looked for a spot in the jetty where it would it neatly. Using a radio, the spotter relayed his suggestions to the crane operator, who gently lowered each one into place. The procedure resembled a large- scale version the video game Tetris. “The key is to have as much interlock between the stones as possible,” said Otto. The boulders that didn’t go straight into the jetty were loaded into what resemble gigantic versions of the classic yellow toy Tonka trucks. The crews hauled them to a staging yard, where they dumped them, sending up plumes of dust. Later, the rocks would be organized by size, weight and shape. What the jetties do “It’s all for navigation. We really want to make it a safe navigation coming in and out of the river,” Otto said. According to the Corps, the jetty system pro- vides a safe and reliable entrance for a $24 bil- lion trade economy that depends on the Colum- bia and Snake river systems. More than 40,000 local jobs rely on that trade. Positioned east of the North Jetty, the rocky expanse of Jetty A lurches due south from Coast Guard station, parallel to the Ilwaco channel. Before it was built, the “thalweg,” or deepest, fastest part of the river, slammed against North Jetty with full-force, damaging the jetty and degrading the effectiveness of the whole jetty system, that includes South Jetty on the south side of the Columbia River. Now, Ancillary beneits Engineers and project managers are working alongside Kiewit Corporation construction crews on the rebuilding of Jetty A. Together with the North and South jetties, Jetty A supports safe ship travel and even healthy salmon habitat. the thalweg delects southward and into the main shipping channel, Otto said. The mouth of the Columbia River is about ive miles wide, but the 9.7 mile, three-jetty sys- tem, reduces that width to approximately two miles. That narrowing makes the river act like a hose, lushing sediment to sea. A properly functioning jetty system greatly reduces the fre- quency and need for expensive dredging. And a clearer, deeper channel means safer ship travel. Dredging Ilwaco Channel Locally, the Ilwaco channel also beneits from a properly functioning jetty system. In 1950, a complete breach of Jetty A caused 200,000 cubic yards of sediment to lood into Ilwaco channel making it virtually impassable. More recently, a 10-year storm surge breached degraded parts of the jetty, and that shifted a lot more sediment than usual into the channel, said Otto. 105 Business-Sales Op 210 Apartments, Unfurnished Be an Astoria Carrier! View our listings at www.beachproperty1.com Beach Property Management 503-738-9068 $100 Signing Bonus! The Daily Astorian is currently seeking independent contractors to deliver its paper and related products in the Astoria Oregon area. Interested individuals must have valid drivers license, reliable vehicle, and insurance. Routes are Monday through Friday afternoons. There are no collections or weekend deliveries. Please come in person to The Daily Astorian office at 949 Exchange St, Astoria OR 97103 to pick up more information. 120 Money to Lend NOTICE TO CONSUMERS The Federal Trade Commission prohibits telemarketers from asking for or receiving payment before they deliver credit repair services, advance fee loans and credit, and recovery services. 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The toll free telephone number for the hearing impaired is 1(800)927-9275. ity of water, and that’s when everything starts illing in,” Glenn said. Otto conirmed that pile dikes work in con- junction with the jetty so that “sediment gets dropped where you want it, and pushed out where you don’t want it.” “If we took out Jetty A, there would proba- bly be an island created where Ilwaco channel is now,” Otto said. Glenn said Port of Ilwaco is working closely with the Corps of Engineers, the Paciic North- west Waterways Association, and congressional delegates to come up with an engineering plan and funding to repair the aging pile dikes. Glenn said dredging is currently the port’s highest priority. The channel wasn’t dredged in 2013, Glenn said, and as a result, a Coast Guard boat hit bottom coming into port, and the Corps had to seek emergency funding. That “was a real challenging year,” Glenn said. Glenn says he has lobbied in Washington, D.C., for funding for a more long-term solution to the silt problem. It’s going to take time, he said, but he’s hopeful that local leaders will be able to fully resolve the pile-dike issue within the next three to ive years. Regular dredging since 2013 has kept the depth and condition of the Ilwaco channel at a very high standard, said Glenn, who reported bigger boats are coming in carrying more ton- nage. When that happens, local economies ben- eit, he said. “It’s a real thing for us,” Glenn said. “We just want to help the Corps be able to do the job. They know it needs to be done. There’s just so many different priorities and funding limita- tions. It’s just a matter of keeping after it.” FREE WOODEN PALLETS Available for pick up at The Daily Astorian loading dock. 949 Exchange St, Astoria NOTICE TO CONSUMERS Oregon Firewood Law requires advertisements quote a price and also express quantity in units of a cord or fractional part of a cord. Ads must also identify the species of wood and whether the wood is unseasoned (green) or dry. ERROR AND CANCELLATIONS Please read your ad on the first day. If you see an error, The Daily Astorian will gladly re-run your ad correctly. We accept responsibility for the first incorrect insertion, and then only to the extent of a cor- rected insertion or refund of the price paid. To cancel or correct an ad, call 503-325-3211 or 1-800- 781-3211. As the rocks dropped on land, Corps crews in the river were back dredging the Ilwaco chan- nel again. Guy Glenn, manager of the Port of Ilwaco, said repairs to Jetty A will deinitely help keep silt and sediment out of Ilwaco chan- nel, but he thinks additional infrastructure proj- ects are needed. “I’m sure there some effects from the jetty deterioration, but we think there’s a larger prob- lem than that,” Glenn said. Glenn said dynamic movements of water and sand around nearby islands are also increas- ing the need for dredging in Ilwaco channel, because pile dikes along Sand Island and at the main stem of the river have decayed to the point where they are either under water or completely detached from land. When that happens, instead of funneling water into the channel to scour out sediment, water lows in behind the pile dikes. “With that low splitting, it slows the veloc- 375 Misc for Sale 560 Trucks If you want results... 74% of Clatsop County Residents read The Daily Astorian and rated Classifieds #1 for the most read section!! ʻ46 Ford 4 Door Super Deluxe, Flat Head V8. New Paint and Upholstry. Runs and drives nice! $12,000 503-728-3562 (From 2010 Astoria Market Study, by Marshall Marketing & Communications, Inc. Pittsburgh, PA) (503)325-3211 ext. 231 or (800)781-3211 classifieds@dailyastorian.com www.dailyastorian.com LET one of our friendly advisors help you word your classfied ad. Call 503-325-3211. 500 Boats for Sale 28ʼ Fishing Boat Fiberglass Stern Reel Gillnetter Roberts Built 220HP V-8 Crusader Nets & Permit May Go With. Call (503)741-0529 After 6pm In addition to providing safe passage for mariners who are headed out to sea, the jetty system also helps ocean-bound salmon. The narrowing effect of the jetties increases the velocity of the water as it passes through the channel. Scientists have discovered that this increase in speed dramatically improves the condition of the Columbia River plume; the zone where fresh water exiting the river meets and rises above the denser saltwater of the Paciic Ocean. According to an environmental assessment provided by the Corps, this multi-layered zone provides key habitat in the life cycle of juvenile salmonids, who often spend the irst few weeks of their ocean life in the plume. Food concen- trates in its fronts and eddies, and the high tur- bidity in the plume also provides cover from predators while the young ish gain strength. Eventually, the quickly moving plume helps the salmon move farther away from shore. The plume also provides important spawning habitat for northern anchovy, an important food source for salmon and humpback whales. Big project, big money Work on Jetty A should be completed by next summer. After that, the Corps will start a roughly year-long effort to rehabilitate North Jetty. In 2019, the Corps will start a more ambi- tious, four-year restoration of South Jetty. According to estimates provided by the Corps in its 2012 “Major Rehabilitation Evaluation report,” the total cost of work on all three jetties is estimated to cost $257.2 million. Corps oficials hope the work will help the jetty system perform well for a long time to come. “Our intent is to not come back out here for 50 years,” Otto said. 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