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The Saginaw River Mouth Boating Access Site will be closed starting on May 1 for some finishing touches on an expansive set of upgrades. The closure is expected to last for two weeks. File photo.

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NEWBURYPORT — Boaters making their way through the river's mouth are feeling the pain of years without a proper dredging of the river's main navigational channel.

Shaffer said the formation of sandbars at the river mouth is one of the clearest signs of how much sediment, once locked behind the massive Elwha and Glines Canyon dams, is coursing down the river.

The Saginaw River Mouth Boating Access Site is set to close this fall for an improvement project, according to the Michigan Department of Natural Resources.