The Navy's Acoustic Research Detachment is located on the banks of Lake Pend Oreille, which provides the perfect conditions for testing new submarine advancements as … Lake Pend Oreille The Mudhole AKA Priest River Campground is located on Priest River and provides a chill summer scene for all the water activities you’ve been dreaming of all winter. Northern Idaho’s Lake Pend Oreille is so deep that it supports U.S. Navy submarine tests and persistent reports of mysterious lake creatures. At 1,158 feet deep, it's the fifth-deepest lake in the nation. Lake Pend Oreille is Idaho’s largest, deepest, and quietest body of water, making it perfect for top-secret underwater missions. And, it might accurately be said that the lake is the home of a creature not unlike Loch Ness, Scotland’s legendary long-necked beast. An investigation is underway to determine why a barge capsized two months ago at the U.S. Navy's stealth submarine research facility at Lake Pend Oreille in North Idaho. Farragut State Park's Buttonhook Bay is a quiet, secluded place at the southwest corner of Lake Pend Oreille. Homes for sale near Pend Oreille Lake can range between $137,000 and $7,000,000, with a total market value of around $100,000,000. Submarine tests are not the only thing that make Lake Pend Oreille stand out. The park adjoins the deepwater Lake Pend Oreille, where the Navy maintains a submarine research center at Bayview, the Acoustic Research Detachment. This is the same period in which the Navy supposedly started using the lake for tests. It … Dug out by Ice Age glaciers and located amid three major frontal ranges of the northern Rocky Mountains, it has natural splendor galore to go with a fascinating human and natural history. It’s in excess of forty miles in length and 1,100 feet in depth. The NSWCCD Acoustic Research Detachment (ARD) is located on Lake Pend Oreille, which is Idaho’s largest, deepest (1,150 feet), and quietest body of water providing an ideal environment for acoustic testing without the attendant problems and costs of open ocean operations. Lake Pend Oreille is Idaho’s biggest, at 43 miles long with 111 miles of shoreline. Lake Pend Oreille is Idaho’s biggest, at 43 miles long with 111 miles of shoreline. It’s also the deepest (at 1,158 feet deep, there are only four deeper lakes in the nation). It's a short walk from nearby Beaver Bay Beach, a popular swimming and fishing spot.. Buttonhook Bay mostly serves as a dock for boats exploring Idlewilde Bay and the larger Lake Pend Oreille, but visitors can also swim from the docks. It's a short walk from nearby Beaver Bay Beach, a popular swimming and fishing spot.. Buttonhook Bay mostly serves as a dock for boats exploring Idlewilde Bay and the larger Lake Pend Oreille, but visitors can also swim from the docks. It is even rumored that the Navy once lost a submarine in the deep, dark waters. This lake is also the largest lake in Idaho, the 8th largest lake in the country by volume, and the 40th largest lake in the country by surface area. It’s also the deepest (at 1,158 feet deep, there are only four deeper lakes in the nation). The U.S. Navy has been testing unmanned model submarines in the depths of Lake Pend Oreille for several decades. Situated in Idaho, Lake Pend Oreille is a huge expanse of water. The land was transferred to the state of Idaho in 1949 and became a state park in 1965. An investigation is underway to determine why a barge capsized two months ago at the U.S. Navy's stealth submarine research facility at Lake Pend Oreille in North Idaho. Its 111 miles of largely undeveloped shoreline, much of it U.S. Forest Service lands, also offer uncharted territory – if you’re willing to walk, boat or paddle.