Dam Removals This Fall will Help Fish and Restore Rivers

Dam Removals This Fall will Help Fish and Restore Rivers

By Rachel Calabro, Narragansett Riverkeeper

Several dam removals are happening this fall across the Narragansett Bay region. The Bradford dam removal and natural fishway project is a continuation of a process to restore historic fish passage to the Pawcatuck River. This project comes on the heels of the removal of the White Rock dam last year, and previous projects at Shannock, Horseshoe Falls and Kenyon Mill. All together these projects are helping fish to access the state’s largest natural body of fresh water, Worden’s Pond.

Save The Bay has assisted with several dam removal projects in the Taunton River watershed, including on the Mill River in Taunton where two dams have already been removed. The third and final dam on this section of river will be coming out this fall. This dam at the former Reed and Barton silver factory is the key to finally getting fish access to Lake Sabbatia and the Canoe River. Other dams being removed this fall are the Cotton Gin Dam on the Satucket River in East Bridgewater, and the Barstowe’s Pond dam on the Cotley River in East Taunton.

Back here in Rhode Island, Save The Bay has been working on a project in North Kingstown to remove the Shady Lea Mill dam. This dam is upstream from one of the state’s largest fish runs at the Gilbert Stuart Museum. This dam removal will restore a sediment filled impoundment to a natural stream, allowing fish and other wildlife to access this new habitat. The project started last week with the removal of a section of the dam, allowing the impoundment to drain. Crews will be back in July to fully remove the dam after a channel has formed in the impoundment and sediment is stable.

Part of the funding for these dam removal projects has come through the Hurricane Sandy relief fund within the US Fish and Wildlife Service. Other funding for the Shady Lea dam removal came through NOAA and the Rhode Island Coastal Habitat Trust Fund.

Dammed Wildlife

Dammed Wildlife

The Kickemuit River Fish Ladder was built on the
Warren Reservoir to give migrating river
herring access to the pond.

By Rachel Calabro, Save The Bay Riverkeeper

Imagine you are a river fish. To thrive in your environment, you have a few requirements. Cool water with enough oxygen will keep you alert and active. Insects that wash downstream or emerge from the stream bottom will keep you fed. Sand and gravel in which to lay your eggs and plenty of places to hide from predators are also keys to survival. When rivers function properly, all these things are in place to support a wide diversity of fish and insects.

But when environmental stresses, such as low water levels or warm water, are present, fish need places to go for refuge. Just like on a hot sunny day you might seek the shade of a tree, fish seek out cold spots in deep pools and under bits of wood in the stream. Fish also need to find mates to increase their genetic diversity and species health. A healthy population of fish will be able to migrate up and downstream and into tributary streams to mix and mingle with others of their species and to find new habitat. These are all parts of a healthy stream ecosystem.

An historic photo of Pawtuxet Bridge and
falls before the dam was removed in 2011. 

Dams, culverts and other physical changes to a stream can cause harm not only to the species living there, but also to the quality of the water and habitat for other wildlife and surrounding ecosystems. Dams change the dynamics of a stream by slowing the water, allowing fine sediment to deposit rather than flow downstream, and changing both temperature and nutrients in the water. Warm water holds less oxygen. Gravels are covered over by fine silts and sands. In essence, a dam turns a river into a pond. Fish that thrive in ponds move in to the newly created habitat, cutting off the upstream habitat from the fish living in the river below. As a result, genetic diversity suffers, and less food comes downstream. The community of river fish changes as well.

Humans have caused many changes to our surrounding environment, but few of our changes to streams and rivers have had as much consequence as dams. Although beavers have made dams for thousands of years, altering the landscape in many ways, these dams are temporary and an important part of creating a constantly changing set of diverse wetland systems. Our wildlife adapt and thrive with these changes. Most of our man-made dams no longer serve their original purpose of providing power for mills. They have become icons of industrial and community heritage with lasting negative effects on river and stream ecosystems.

The Hopewell Mills dam was removed in 2012 to restore the
Mill River in Taunton, Massachusetts. Three dams on
this river are being removed.

Efforts to restore migrating fish populations with fish ladders have allowed us to leave the dams and preserve their legacy while trying to accommodate some lost river function. But these aging structures are becoming a hazard for our communities as they reach the end of their functional lives, threatening either to release years of sediment that has accumulated behind them or flooding downstream towns and structures when they fail.

Climate change is adding to the challenge of managing undersized and outdated dams. Unpredictability in our weather and increasing severity of both droughts and floods will require our ecosystems to be more resilient and our wildlife to be more adaptive. This means allowing for more migration, more chances to find refuge, and more diversity in habitat. Mammals and birds can migrate across the landscape and can move in response to shifts in temperature. Fish can migrate only as far as they can swim, and for many, that means as far as the next dam upstream. We are seeing major shifts in ocean fish related to changing ocean temperatures, so we expect populations of freshwater fish to change as well.

The Hopewell Mills dam was removed in 2012 to
restore the Mill River in Taunton, Massachusetts.
Three dams on this river are being removed.

Thanks to the Industrial Revolution, New England has a larger density of small dams than any other place in the country. More than 600 dams still stand in Rhode Island, more than 3,000 in Massachusetts, and more than 6,000 in Connecticut. Many of these dams are over 200 years old. Working with various local partners, as well as partners in state and federal government, Save The Bay supports dam removal projects that aim to create resilient streams with diverse habitats.

Dam removal has really gathered steam in Massachusetts, where more than 50 dams have been removed in the last 15 years. The Commonwealth has an entire Division of Ecological Restoration that works not only on dams, but on culverts, stream flow and wetland restoration. The state has made a concerted effort to support these projects through capitol authorizations and grant programs.

Rhode Island also has a small habitat restoration fund and supports river restoration projects through state bond referenda, but no dedicated program for riverine habitat restoration exists in state government. Here, local watershed councils and others must initiate fundraising and manage projects. Save The Bay has assisted on several dam removal projects in both Rhode Island and Massachusetts, providing technical, fundraising and outreach support. These projects require multiple partners, from the federal government to local volunteers, and take many years to complete.

Of the 496 animal species federally listed as threatened or endangered, nearly half are freshwater species that have found themselves living in small habitat “islands” due to the cumulative effects of dams, roads and development. This makes them extremely vulnerable to one-time events such as last year’s drought, which dried up small streams in the Taunton watershed and killed many localized populations of rare freshwater mussels.

Diadromous fish—those that migrate between fresh and salt water, like herring, shad, sturgeon, smelt and eels—have all suffered population declines to less than five percent of historic levels, and many rivers lost these species completely. In addition, only about five percent of historic brook trout populations remain and are extremely vulnerable to temperature stress. We have seen many gains in water quality in the last few decades, but we still must remain vigilant in the protection of our most vulnerable freshwater species. The Narragansett Bay watershed depends on us.

Rattlesnake Brook Dam Removed in Freetown

The Taunton River watershed is becoming more fish friendly as another dam is removed in an effort to increase habitat. The Rattlesnake Brook Dam, owned by the Fall River water department, was recently removed to help fish access habitats cut off for almost 200 years. The dam had partially failed and was unsafe in its former condition. Rattlesnake Brook is part of the Assonet River watershed, which drains into the Taunton River just north of Fall River. Assonet Bay has some of the healthiest salt marshes in the Narragansett Bay watershed and is home to threatened diamondback terrapins.

Dam removal is becoming commonplace in Massachusetts as a way to eliminate flooding risk and to restore free flowing rivers. This project is the 44^th dam removal to take place in the state, and already the total has reached to over 50. Three more dam removal projects are planned for next year in the Taunton River watershed, and other dams are in study. The Taunton River was designated as a Wild & Scenic River in part because of its large and healthy fish run. The migratory river herring run is the largest in the state and will increase as other rivers are opened up for spawning. American eel, white perch and shad are also benefitting from these projects.

Save The Bay has been supporting these projects as a partner for many years. We provide outreach and community support to get projects started, and technical support as they move through design. Habitat restoration in the Taunton River watershed is one of our long term strategic goals. Rivers that are free flowing and connected are better able to support wildlife and are more resilient to changes in climate. We look forward to supporting more projects in the coming years.

Remembering Not to Forget

How did we lose sight of the riches our streams and rivers once provided?  Accounts from early European settlers tell of unimaginable numbers of fish filling the rivers during spring spawning runs. There were so many fish that thousands could be caught in a day, and hundreds were placed in fields as fertilizer. Eels were in such large abundance that they were used for everything from horsewhips to hair oil. It’s been estimated that eels once made up one-fourth of all fish biomass in rivers on the Atlantic coast.

In his book, RunningSilver, John Waldman talks of the shifting baselines syndrome where we begin a pattern of forgetting that over the generations shifts our understanding of the true nature of these systems. You can say the same about global warming. As each generation becomes more and more used to a world without snow, we will forget that outdoor ice skating was oncecommonplace in Rhode Island and will believe that ice on Narragansett Bay is an“extraordinary” occurrence.

In the beginning, fish runs were preserved with bypass channels as mills were built, and farmers would come and take dams down by force if necessary. A 1735 Massachusetts law did not allow dams on rivers that would serve as a barrier to fish. This law was generally ignored and as rivers were taken over by human machinery, many mill owners just waited until the fish runs became smaller and smaller to the point where people forgot. They then claimed that fish had never run in the river, and it made no economic sense to restore them. A 1920 state inventory of river herring found that the Mill River in Taunton was so badly polluted by manufacturing waste that restoration of the fishery would be “impossible”.

We began to forget, but the fish did not. The fish persisted and even in the beginning of this century runs of river herring on the Taunton River remained above two million fish. Today, we have removed some obstacles and have restored water quality to a degree, but the fish are not returning. We all speculate on the reasons, and they are many.

Slowly, our public resources were taken over by private interests and now restoration must be done with public money. Many private dam owners are willing to take down their unwanted dams, but not without the help of federal and state agencies who pay most if not all of the cost. Because fish passage restoration is a goal of the government, we are willing to see this happen. State agencies have the duty to protect the public, so they inspect private dams, rather than require owners to do it themselves. How did we get here, and why do we allow these attitudes to persist? It certainly is the tragedy of the commons, but we should not leave it at that. We should reevaluate what a shared resource means for all people and all species, and not forget what we once had, even if we can’t go back in time.

Whittenton Dam Removal on the Mill River

Another dam has gone from the Mill River in Taunton, leaving the Reed & Barton dam as the only impediment to fish passage on the river. A new fish ladder has been constructed at Lake Sabbatia which will allow fish access to over 30 miles of habitat in the upper watershed. This dam is special because it was the catalyst for much of the recent discussion of dam safety, dam removal and floodplain restoration in both Massachusetts and Rhode Island. Our efforts in Rhode Island to have better disclosure of dam safety and increased dam inspections have come from our experience in Taunton. You can see much more about the project on the Mill River Restoration blog.

This recent coverage of the project from ABC6 news also shows the history of this dam and the importance of the restoration. The dam came out relatively quickly this week, and the entire project should be completed by September. Next year's removal of the Reed & Barton dam will see the project come full circle and will allow fish full access to the entire river corridor.

Removal of the Hopewell Mill dam last August was very successful and the river is beginning to take shape.

A good New Year for Massachusetts dam safety

The Massachusetts legislature has approved a bill that will strengthen dam safety and provide a new loan fund to help remove and repair dams and coastal infrastructure. The bill has been in the works for many years and has taken several forms. This newest incarnation had the added strength of including structures like seawalls in the $17 million loan fund.

The bill strengthens dam safety by requiring that emergency action plans be written for high and significant hazard dams. It also raises the fines that the Department of Conservation and Recreation can collect from owners whose dams are in violation of dam safety regulations. Another provision allows towns to bond for dam removal projects.

Rhode Island has similar rules about emergency action plans for high hazard dams, but many towns are in violation of this regulation and the Department of Emergency Management has no authority to enforce this portion of the law. In 2011, the Rhode Island legislature did include dam removal as an activity that towns can bond for using the authority of the Rhode Island Clean Water Finance Agency.

Advocates in Rhode Island are interested in developing some type of funding mechanism for the repair and removal of dams, and Save The Bay has worked on legislation for the last two sessions that would require dam owners to inspect their own dams. This has been a rule for several years in Massachusetts. We will continue to make this a priority in the next legislative session.

Removal of Hopewell Mills Dam

This summer, the first of three dam removal projects on the Mill River in Taunton got underway. The Hopewell Mills dam, located next to the Taunton State Hospital was removed in August.

The project is still underway as contractors create a new river channel through the former impoundment. The removal of this dam will create a larger floodplain that can store water at high flows, protecting downtown Taunton from flooding. The removal of two dams upstream will also increase flood storage and allow fish to migrate up to Lake Sabbatia for the first time in 200 years. You can see more information and photos at millriver.blogspot.com

Pawtuxet Falls Dam Removal

This week we are celebrating the removal of the Pawtuxet Falls Dam in Pawtuxet Village. Neighbors and citizens have been coming out and enjoying the view, watching the hydraulic hammer at work. This project is very visible and while not everyone agrees with it, it has become a good educational tool to teach about river restoration. I am blogging about the project at our project blog, and you can see lots of photographs on the Save The Bay Facebook page.

Lower Shannock Falls Dam removed

The Lower Shannock Falls Dam in Richmond was removed today as part of a larger river habitat and fish passage restoration project on the Pawcatuck River. The Wood-Pawcatuck Watershed Association (WPWA) and project partners including Save The Bay, are working to provide fish passage at the three dams on the upper Pawcatuck River: Lower Shannock Falls, Upper Shannock (or Horseshoe Falls) and Kenyon Millpond Dam. The project will allow access to 10 miles of the Pawcatuck River and will open up an additional 1,300 acres of spawning habitat including Wordens Pond. This dam, which no longer served its intended purpose, prevented access to migrating fish such as American shad and river herring. The dam was originally built in the 1820s as part of a textile mill. The mill site next to the river is being redeveloped into a public access and riverfront park by the Town of Richmond.

Project partners include the NOAA Restoration Center, the US Fish and Wildlife Service, USDA Natural Resources Conservation Service, Trout Unlimited, American Rivers, Town of Richmond, RI CRMC and RI DEM. Partial funding came from the ARRA federal stimulus package. Save The Bay supported this project through our partnership with Restore America's Estuaries and NOAA.

This project is one of several large dam removal projects that Save The Bay is working on in partnership with local river groups and state and federal agencies. These include Paragon Dam on the Woonasquatucket River in Providence, Pawtuxet Falls dam on the Pawtuxet River, State Hospital dam on the Mill River in Taunton and Barstowes Pond dam on the Cotley River in Taunton. See the video below of today's removal!

Failure of the Forge Pond Dam in Freetown is a Wake Up Call for Dam Owners

Last week, the Forge Pond dam on the Assonet River in Freetown came close to collapsing. The 300 year old dam is one of the most unsafe dams in Massachusetts and has been a target for removal for at least a decade. This dam was a chronic issue for the Office of Dam Safety, and the owner ignored fines and orders to fix or remove the dam. The owner died last year, leaving a derelict dam in the hands of state and local officials. While Dam Safety had removed the gates and lowered the pond, someone continued to plug up the dam and the pond reimpounded, spilling over and eroding the structure.

Most of the dam will now be removed by the state, creating a river channel that will allow fish passage. The dam directly downstream had the same owner and is also in extremely poor condition. We hope to work with the town to have that dam removed as well. Options for the first dam on the river also need to be explored, since the Assonet River is habitat for rainbow smelt - a protected species that is in decline. These fish spawn at the head of the tide on gravel stream bottoms. Dam removal will also open up this river for other migratory fish such as river herring and American eel.

Dams across the state are living on borrowed time, and many of our communities are at risk. These dams were built decades to centuries ago and many of them, perhaps most, no longer serve the function that they were built to provide. Closing our eyes to the problem doesn't make it disappear. The most cost-effective, permanent way for communities to solve the problems of unsafe dams is to remove them.

This near disaster comes less than five years after the failure of the Whittenton Pond dam in Taunton forced the evacuation of the downtown during a 2005 storm. That wake up call led to a state-wide review of dams in both Massachusetts and Rhode Island and much more aggressive enforcement by both dam safety programs. The states are doing their part of the job. This latest incident at Forge Pond highlights the need for dam owners to take personal responsibility and recognize their own liability.