Report of the Superintendent ... Showing the Progress of the WorkU.S. Government Printing Office, 1922 |
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100-fathom curve Alaska arc of precise area covered bench marks established bureau Cape Cape Mendocino Catanduanes Island channels charts Chilkoot Inlet Clarence Strait Coast and Geodetic Coast Pilot Commanding Steamer completed depth determined double angles Dixon Entrance drag engineers entrance extended fathoms feet field fiscal Geodetic Survey geographic positions determined Harbor horizontal measures Icy Bay important Inlet inshore Island June 30 Ketchikan launches Lieut located Lynn Canal main scheme occupied maps meridian miles of area miles run Mississippi navigation needed northward Observatory occupied for horizontal offshore old stations operations Oreg Pacific coast positions determined double precise levels precise traverse precise triangulation reefs resurvey River rocks run while sounding San Pablo Bay scale ship shoals shore line square miles stations occupied Stephens Passage SUMMARY OF RESULTS.-Triangulation surveyors tidal stations tide gauge tide tables tions topographic U. S. Coast vessels vicinity Vieques Washington wire-drag
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66 ページ - Fig. 21, opposite.) 68. STEAMER ROUTES, SOUTHEASTERN ALASKA. — In southeastern Alaska the first and most obvious need is to complete the wire-drag work. Most of these waters have been sounded, so that only dragging is necessary to complete the survey.
4 ページ - is issued jointly by the Coast and Geodetic Survey and the Bureau of Lighthouses.
37 ページ - YORK. — There is scarcely any part of our coast where correct soundings are of more importance than in the approach to New 'York from the eastward, as all trans-Atlantic steamers bound to that port pass over this area. Many of them have to depend on soundings for safety. A fairly good survey of this area is available, but additional work should be done by modern methods in the portion out of sight of land, so that the needs of the enormous traffic will be met. (See Fig.
72 ページ - ... carrying the work out to a depth that will be certain to include all dangers. In these waters shoals rise abruptly from great depths, and the absence of soundings on the charts does not imply safety, but simply absence of surveys. 77. HAWAIIAN ISLANDS. — There are only two good harbors on all the Hawaiian Islands, and both of these are on Oahu Island. All of the islands except Hawaii have coral reefs around at least part of them. In the vicinity of Oahu, Maui, Kahoolawe, and the south coast...
48 ページ - The inshore portion along the rest of the Louisiana coast, and the Texas coast, with an important exception, has deep water fairly close to the shore. The exception is along the eastern part of the Texas coast from Sabine Pass to Galveston. Sabine Bank and Heald Bank have shoal depths at a considerable distance from the shore, and they should have a thorough resurvey. Galveston Bay also needs resurveying.
43 ページ - ... subject to change except as noted below, and the surveys, while by no means complete, are fair. Off Cape Canaveral and outside the southern half of the Indian River there are extensive banks and ridges in urgent need of resurvey. Known depths of 11 to 16 feet a long way offshore show the need of further surveys to make certain that all the shoals are correctly charted. From Jupiter Inlet to Fowey Rocks, where the Florida Reefs begin, the deep water approaches so close to the shore that it will...
37 ページ - Not only do the present charts lack the needed information in the search for new grounds, but the absence from the charts of existing shoals is a source of danger to the boats running to and from the harbor. Breakers often occur where there is ample depth for boats when the water is smooth. This is an excellent example of how a region usually avoided by commerce may be of importance to an industry which furnishes part of the food supply of the Nation.
56 ページ - Yet. in spite or the immense expenditures for improvements, there is not a single one of these harbors the approaches to which have been adequately surveyed. The approaches to the Columbia River have been sounded for a short distance offshore, but even in this area the soundings are too far apart to more than indicate, in a general way, the depth which may be expected. This partial survey extends southward along the coast to include the approaches to two other harbors. The approaches to the remaining...
66 ページ - Fig. 6, opposite.) 7. PENOBSCOT BAY TO CASCO BAY (MODERATE DRAFT). — From the western entrance of Penobscot Bay to Casco Bay there has been no wire-drag work done. The inside route is constantly used by coasting steamers, but it is certain that it has within its limits many uncharted rocks, some known locally and some unknown. (See Fig7, opposite.) 8.
65 ページ - There are no adequate surveys of the inshore area along the State of Oregon. Of the water off the northern part of the Pacific coast little is known, except that the Bureau of Fisheries, acting on the information obtained from fishermen, has located certain banks. These banks should be surveyed to determine their depth and extent, and it is believed that a general survey carried out to the 1,000-fathom curve will result in the discovery of other banks of great value. (See fig.