[Question] Noise laws for the upper Columbia Snake Rivers
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Noise laws for the upper Columbia Snake Rivers

  1. #1
    Member DarylP's Avatar
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    Default Noise laws for the upper Columbia Snake Rivers

    Sorry if this is a duplicate posting. Can't seem to find the first one.

    Does anyone know if I can run open over the Transom Headers on my Tahiti on the Columbia and Snake rivers up here around the Tri-Cities?

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    Default Muffler laws

    Quote Originally Posted by DarylP View Post
    Sorry if this is a duplicate posting. Can't seem to find the first one.

    Does anyone know if I can run open over the Transom Headers on my Tahiti on the Columbia and Snake rivers up here around the Tri-Cities?
    This is a page from the Washingon Handbook:


    Mufflers and Noise Level Limits
    Every vessel with an engine must be equipped with a muffler system that is in good working order and in constant operation to prevent excessive noise.

    A vessel must not exceed the following noise levels.

    •Measured using a stationary test: for engines manufactured before January 1, 1994, a noise level of 90 decibels; for engines manufactured on or after January 1, 1994, a noise level of 88 decibels
    •Measured from the shoreline: for all vessels, an operational noise level of 75 decibels
    You may not remove or modify a muffler or muffling system if the result is increased noise level.

    The use of a muffler cutout or a muffler bypass system is prohibited, except while engaged in organized racing events in an area designated for that purpose.

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    Member DarylP's Avatar
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    Well right now it's a through transom system with no muffler.. Not sure how much of a DB rise a over the transom would make.

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    Default Decibles

    I have a hallett vector w/ thru transom , no mufflers and passed both tests. Sherman County sherriff, on the Columbia at the mouth of the john Day river...

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    Junior Member Thunderfoot's Avatar
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    Quote Originally Posted by boat527 View Post
    •Measured using a stationary test:
    This is the key wording...!!! most TT exhaust is below the water line which muffles the noise, with OT exhaust your out in the air and noise level is much higher!

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    Default Handbook

    Quote Originally Posted by boat527 View Post
    This is a page from the Washingon Handbook:


    Mufflers and Noise Level Limits
    Every vessel with an engine must be equipped with a muffler system that is in good working order and in constant operation to prevent excessive noise.

    A vessel must not exceed the following noise levels.

    •Measured using a stationary test: for engines manufactured before January 1, 1994, a noise level of 90 decibels; for engines manufactured on or after January 1, 1994, a noise level of 88 decibels
    •Measured from the shoreline: for all vessels, an operational noise level of 75 decibels
    You may not remove or modify a muffler or muffling system if the result is increased noise level.

    The use of a muffler cutout or a muffler bypass system is prohibited, except while engaged in organized racing events in an area designated for that purpose.
    Do you by any chance have a link to the Washington handbook? I'm building a little crackerbox just for playing with and had some questions. couldn't find it online. thanks. Sorry for the hijack.

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