Pine River, Minnesota

AND SO THE PROJECT BEGINS:

As Landwehr Construction began gathering rock and boulders off-site for the rock riffle project, construction of the Rock Riffle project began at the site Monday, October 18^th with removal of material under the TH 84 Bridge.

 

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WEEK OF 11.8.21:

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• The Bathroom Building  & Some Trees in the City Park Were Removed

 

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  WEEK OF 11.15.21:

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•   Construction of a Rock Causeway Across the River Channel Began

The Rock Causeway   Native rocks & boulders from the surrounding area are being used to make the causeway.

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WEEK OF 11.22.21:

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• With the Rock Causeway in Place, a Dirt "Road" Was Fashioned Over The Rock Surface

With the  surface depth & width satisfactory, a trench was dug into which the sheet piles would begin to be placed.

One might logically ask, "What is a Sheet Pile?"

This is a wall made up of 2' wide steel panels that  are pounded vertically under the surface, each joining the next by a "Ball & Channel" design, thus creating a water barrier.

 

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 WEEK OF 11.29.21:

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• Placement of the Sheet Pile Continued West to East Into the River Creating a Water Bypass
• Then Turned Southward Back Toward the Bridge to Re-Route Water Away From the Old Dam

• Once Completed, the Water Began to Lower at the Steps and at the Old Dam

	It is interesting to see the layout of the  river bed below the surface of the water.
The Old Dam's Days Are Numbered!	You Have Been A Faithful Old Piece of Concrete & Metal!  You Have Witnessed Much Of The City's History & Have Been The Focal Point Of Many Fond Memories.  Farewell, Old Friend!

 CLICK HERE TO SEE THE LAKELAND PUBLIC TELEVISION

ROCK RIFFLE REPORT

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 WEEK OF 12.4.21:

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	In preparation for the demolition of  the earthen / concrete street dam, it was necessary to divert water away from the old dam.
A series of three bypass culverts were eventually installed: 2) 36" culverts and, 1) 24" culvert. They would serve to handle the input / output of the appropriate amount of water flow needed in order to maintain satisfactory lake & river levels.     Pictured here is the bypass culvert outlet.
	A "temporary dam" was created on the opposite side of the bridge to hold the water back from returning to the old dam.
	The Outlet (Right) The Inlet (Left: culverts just under the surface)

"The Bypass" Pictured here is the temporary sheet pile which was used to divert the river to the east side of the work area.  The group of people standing out on the first weir represent the following: Landwehr Construction ♦ Pine River Public Works ♦ DNR Fisheries ♦  DNR Hydrologist ♦ a Rock-Riffle Specialist ♦ Bolton-Menk Engineers. They are discussing the individual placement of the base rock.

 

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 WEEK OF 12.13.21:

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• Once The Waters Were Successfully Diverted, Demolition Of The Sweet Old Dam Began.

 

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WEEK OF 12.20.21: 

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 A Granular Filter Layer Was Placed Over the Floor of the River.

 Landwehr Has Begun Setting the 3' to 5' Diameter Boulders on the Individual Riffles.

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MONTH OF JANUARY 2022: 

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The last remnants of the old dam were removed to make way for construction of the riffle rapids.

The next step would be to place the bedding, which consisted of 1 to 2 foot rocks.

At last, with the filter and bedding layers in place, the tedious job of strategically placing smaller rip-rap rocks, larger rocks and boulders in sloping rows began, thus creating the "riffles".   

Rocks were placed in such a way as to create "resting pools" for fish!  How exciting!!

 

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MONTH OF FEBRUARY 2022: 

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Once  the rock arch rapids were in place on the west side, the water was diverted from the undeveloped east side, and water began to  run over the riffle. 

With water now flowing through the main portion of the riffle, work began on the east side of the river to finish the rock arch rapids reaching the opposite bank of the river.

Click the photo below to watch a Landwehr Construction video of the project

"Big Boys with their Big Toys"

"Spring Unfolding"

 

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PROJECTED NEXT STEPS: (SEE: The Restoring, Reconstructing & Expanding The Dam Park)

• Street and Sidewalk Construction
• Fishing Pier Construction
• Placing Sod
• Placing Plantings
  

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