Moving mussels

Cheryl Daigle from the Penobscot River Restoration Trust.

Today you're hearing from Cheryl Daigle, the community liaison and outreach coordinator for the Penobscot River Restoration Trust. This post is part of a series running all month on freshwater mussels, highlighting their importance to the Northeast landscape and the concerted efforts underway to ensure their future in our waters.

Working on a river restoration project that is focused on restoring 11 species of sea-run fish -- including the enigmatic shortnose sturgeon and leaping wonder of salmon -- offers many fascinating moments of discovery about rivers, community, and restoration of place.

Yet, I never imagined freshwater mussels would invite the depths of thought I had while helping to relocate exposed mussels to deeper habitat during the removal of the Great Works Dam and subsequent lowering of the impoundment to a natural river flow.

Reviving a river: Free-flowing waters at Great Works Dam

Each week, our folks at the Maine field office are driving by to check on the progress of the Great Works Dam removal, part of the Penobscot River Restoration Project.

The majority of the heavy lifting at Great Works is complete, so we'd like to share a series of photos capturing the incredible progress made since June this year -- a representation of many years of conservation efforts. 



See more Great Works dam updates. 

Reviving a river: Checking in at Great Works Dam

Each week, our folks at the Maine field office are driving by to check on the progress of the Great Works Dam removal, part of the Penobscot River Restoration Project.

Our Maine hydro licensing coordinator, Steve Shepard, says, "Imagine running these rapids. I hear it was done last week, though the fish have been doing it for weeks!"

 

See more Great Works dam updates. 

Reviving a river: Checking in at Great Works Dam

Each week, our folks at the Maine field office are driving by to check on the progress of the Great Works Dam removal, part of the Penobscot River Restoration Project.

As the Penobscot River Restoration Trust says: "The next best thing to the sight of a newly restored, free-flowing stretch of river? The sound of water coursing through natural ledges and cobbles. An amazing transformation has been taking place on this stretch of the Penobscot River!"

Reviving a river: Checking in at Great Works Dam

Each week, our folks at the Maine field office are driving by to check on the progress of the Great Works Dam removal, part of the Penobscot River Restoration Project.

Our Maine hydro licensing coordinator, Steve Shepard, tells us, "The folks with the big toys are making steady progress!"

Work is starting on the remains of the Legacy Dam which dates back to days of hydromechanical power when there were reportedly 120 mills between Old Town and Bangor. 

Reviving a river: Checking in at Great Works Dam

Each week, our folks at the Maine field office are driving by to check on the progress of the Great Works Dam removal, part of the Penobscot River Restoration Project. 

The two big timber crib sections in the background are nearly demolished! Two excavators in the foreground are demolishing another concrete section with hoe rams (impressive hydraulic hammers that have 4-5 tons of impact).

In the center of the photo, the excavator near the dam is completing a fish passage channel that will become the thalweg of the river, or its lowest point. After that is complete, the coffer dam will be removed, and the water will drop to something close to the new level. 

Credit: Steve Shepard/USFWS

Reviving a river: Checking in at Great Works Dam

Each week, our folks at the Maine field office are driving by to check on the progress of the Great Works Dam removal, part of the Penobscot River Restoration Project. 

Demolition is proceeding smoothly with the help of very low flows and the ability to work within the coffer dam. The outer timber crib section is nearly gone and the next one may be chewed up by the end of the week.  

Reviving a river: Checking in at Great Works Dam

Each week, our folks at the Maine field office are driving by to check on the progress of the Great Works Dam removal, part of the Penobscot River Restoration Project. 

These photos are not from the same perspective as previous, but you get a better appreciation of the current state of the dam. The concrete section at left is nearly gone and most river flow passes through this breach.

Credit: Steve Shepard/USFWS

Reviving a river: Checking in at Great Works Dam

Each week, our folks at the Maine field office are driving by to check on the progress of the Great Works Dam removal, part of the Penobscot River Restoration Project.

The contractor was able to get back to work late last week (hurray!). Check out the photos taken by the Penobscot River Restoration Trust.

Reviving a river: Checking in at Great Works Dam

Each week, our folks at the Maine field office are driving by to check on the progress of the Great Works Dam removal, part of the Penobscot River Restoration Project.

This graph shows that the water has remained flooded. It was at less than 7,000 cubic feet per second when it was breached and then peaked at 70,000 cubic feet per second. We're hopeful that work can start back up in another week.

Reviving a river: Dam breached!

Each week, our folks at the Maine field office are driving by to check on the progress of the Great Works Dam removal, part of the Penobscot River Restoration Project. 

The dam was breached this past Saturday! Watch the video here (you may want to skip ahead to minute 11).

Courtesy Penobscot River Restoration Trust

 
However, Old Town has seen some pretty serious rain lately. It may be a couple weeks before folks can get back to work. 

Credit: Steven Shepard/USFWS

 
See older photos here. 

Reviving a river: Checking in at Great Works Dam

Each week, our folks at the Maine field office are driving by to check on the progress of the Great Works Dam removal, part of the Penobscot River Restoration Project.
 
The photo is taken from the Bradley shore on the east side looking at the dam from downstream. You can see the 1930s fishway in the center, with the pulp mill on the left.

We'll be seeing a lot more change on the section at left as continues. 



Credit: Steven Shepard/USFWS



This is part of a series on fish passage. Read the other blog posts here.