NOAA ENCŪ NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION US4CA46M - UPPER REACHES OF THE OLD RIVER AND MIDDLE RIVER INDEX: NOTE A AUTHORITIES NOTE C - VTS WARNING - PRUDENT MARINER SUPPLEMENTAL INFORMATION CAUTION - SMALL CRAFT CAUTION - SUBMARINE PIPELINES AND CABLES CAUTION - TEMPORARY CHANGES CAUTION - USE OF RADIO SIGNALS (LIMITATIONS) CAUTION - DREDGED AREAS CAUTION - WARNING CONCERNING LARGE VESSELS CAUTION - QUALITY OF BATHYMETRIC DATA POLLUTION REPORTS RADAR REFLECTORS BRIDGE AND OVERHEAD CABLE CLEARANCES RULES OF THE ROAD (ABRIDGED) BROADCASTS OF MARINE WEATHER FORECASTS AND WARNINGS BY MARINE RADIOTELEPHONE STATIONS MARINE WEATHER FORECASTS NOAA WEATHER RADIO BROADCASTS ADMINISTRATION AREA WATER LEVELS, CURRENTS, AND TIDES COMMENTS REQUESTED ADDITIONAL INFORMATION AIDS TO NAVIGATION NOTES: NOTE A Navigation regulations are published in Chapter 2, U.S. Coast Pilot 7. Additions or revisions to Chapter 2 are published in the Notice to Mariners. Information concerning the regulations may be obtained at the Office of the Commander, 11th Coast Guard District in Alameda, California or at the Office of the District Engineer, Corps of Engineers in Sacramento, California. Refer to charted regulation section numbers. AUTHORITIES Hydrography and topography by the National Ocean Service, Coast Survey, with additional data from the Corps of Engineers, Geological Survey, and U.S. Coast Guard. NOTE C - VTS The U.S. Coast Guard operates a mandatory Vessel Traffic Services (VTS) system in the San Francisco Bay and surrounding areas. Vessel operating procedures and designated radiotelephone frequencies are published in 33 CFR 161, the U.S. Coast Pilot, and/or the VTS User's Manual. The entire area of the chart falls within the Vessel Traffic Services (VTS) system. WARNING - PRUDENT MARINER The prudent mariner will not rely solely on any single aid to navigation, particularly on floating aids. See U.S. Coast Guard Light List and U.S. Coast Pilot for details. SUPPLEMENTAL INFORMATION Consult U.S. Coast Pilot 7 for important supplemental information. CAUTION - SMALL CRAFT Small craft should stay clear of large commercial and government vessels even if small craft have the right-of-way. All craft should avoid areas where the skin divers flag, a red square with a diagonal white stripe, is displayed. CAUTION - SUBMARINE PIPELINES AND CABLES Additional uncharted submarine pipelines and submarine cables may exist within the area of this chart. Not all submarine pipelines and submarine cables are required to be buried, and those that were originally buried may have become exposed. Mariners should use extreme caution when operating vessels in depths of water comparable to their draft in areas where pipelines and cables may exist, and when anchoring, dragging, or trawling. Covered wells may be marked by lighted or unlighted buoys. CAUTION - TEMPORARY CHANGES Temporary changes or defects in aids to navigation are not indicated. See Local Notice to Mariners. CAUTION - USE OF RADIO SIGNALS (LIMITATIONS) Limitations on the use of radio signals as aids to marine navigation can be found in the U.S. Coast Guard Light Lists and National Geospatial-Intelligence Agency Publication 117. Radio direction-finder bearings to commercial broadcasting stations are subject to error and should be used with caution. CAUTION - DREDGED AREAS Improved channels are subject to shoaling, particularly at the edges. CAUTION - WARNING CONCERNING LARGE VESSELS The "Rules of the Road" state that recreational boats shall not impede the passage of a vessel that can navigate only within a narrow channel or fairway. Large vessels may appear to move slowly due to their large size but actually transit at speeds in excess of 12 knots, requiring a great distance in which to maneuver or stop. A large vessel's superstructure may block the wind with the result that sailboats and sailboards may unexpectedly find themselves unable to maneuver. Bow and stern waves can be hazardous to small vessels. Large vessels may not be able to see small craft close to their bows. CAUTION - QUALITY OF BATHYMETRIC DATA The areas represented by the object M_QUAL (Quality of data) are approximate due to generalizing for clarity. Caution is advised, particularly for nearshore navigation or voyage planning. M_QUAL represents areas of uniform quality of bathymetric data. The CATZOC (Category of zone of confidence in data) attribute of M_QUAL provides an assessment of the overall zone of confidence. POLLUTION REPORTS Report all spills of oil and hazardous substances to the National Response Center via 1-800-424-8802 (toll free), or to the nearest U.S. Coast Guard facility if telephone communication is impossible (33 CFR 153). RADAR REFLECTORS Radar reflectors have been placed on many floating aids to navigation. Individual radar reflector identification on these aids has been omitted from this chart. BRIDGE AND OVERHEAD CABLE CLEARANCES Clearances are charted as furnished by the Corps of Engineers and U.S. Coast Guard. Overhead cable clearances are referred to high water. Bridge clearances are referred to High Water (HW) and Low Water (LW). RULES OF THE ROAD (ABRIDGED) Motorless craft have the right-of-way in almost all cases. Sailing vessels and motorboats less than twenty meters/sixty-five feet in length shall not hamper, in a narrow channel, the safe passage of a vessel which can navigate only inside that channel. A motorboat being overtaken has the right-of-way. Motorboats approaching head to head or nearly so should pass port to port. When motorboats approach each other at right angles or obliquely, the boat on the right has the right-of-way in most cases. Motorboats must keep to the right in narrow channels, when safe and practicable. Mariners are urged to become familiar with the complete text of the Rules of the Road in U.S. Coast Guard publication "Navigation Rules". BROADCASTS OF MARINE WEATHER FORECASTS AND WARNINGS BY MARINE RADIOTELEPHONE STATIONS CITY FREQ BROADCAST TIMES/PST San Francisco, CA 157.1 MHz 8:30 & 11:00 AM, 1:30 PM (winter) *2670 kHz 6:03 AM & PM * Preceded by announcement on 2182 kHz and 156.8 MHz Distress calls for small craft are made on 2182 kHz or channel 16 (156.80 MHz) VHF MARINE WEATHER FORECASTS NATIONAL WEATHER SERVICE TELEPHONE NUMBERS OFFICE HOURS Eureka, CA (707) 443-6484 8:00 AM - 5:00 PM M-F* San Francisco Bay Area, CA (831) 656-1725 8:00 AM - 4:00 PM M-F* Oxnard, CA (805) 988-6610 7:00 AM - 3:00 PM M-F* San Diego, CA (619) 675-8706 8:00 AM - 4:00 PM M-F Sacramento, CA (916) 979-3051 8:00 AM - 4:00 PM M-F * Recorded forecasts only at other times NOAA WEATHER RADIO BROADCASTS The NOAA Weather Radio stations listed below provides continuous weather broadcasts. The reception range is typically 20 to 40 nautical miles from the antenna site, but can be as much as 100 nautical miles for stations at high elevations. CITY STATION FREQUENCY BROADCAST TIMES Mt. Pise, CA KHB-49 162.40 MHz WX2 24 hours daily Mt Umunhum, CA KEC-49 162.55 MHz 24 hours daily WWF-64 162.45 MHz 24 hours daily Sacramento, CA KEC-57 162.55 MHz WX1 24 hours daily ADMINISTRATION AREA The entire extent of this ENC cell falls within the limits of an Administration Area. This area covers land, internal waters, and territorial sea. The territorial sea is a maritime zone which the United States exercises sovereignty extending to the airspace as well as to its bed and subsoil. For more information, please refer to the Coast Pilot. WATER LEVELS, CURRENTS, AND TIDES Real-time water levels, tide predictions, and tidal current predictions are available on the internet from NOAA's Center for Operational Oceanographic Products and Services (CO-OPS) at https://tidesandcurrents.noaa.gov/water_level_info.html and https://tidesandcurrents.noaa.gov/currents_info.html. COMMENTS REQUESTED NOAA encourages users to submit inquiries, discrepancies, or comments about this chart via NOAA's ASSIST tool at https://www.nauticalcharts.noaa.gov/customer-service/assist/. ADDITIONAL INFORMATION Additional information can be obtained at www.nauticalcharts.noaa.gov AIDS TO NAVIGATION Consult U.S. Coast Guard Light List for supplemental information concerning aids to navigation. END OF FILE