{"id":39836,"date":"2025-06-16T08:00:47","date_gmt":"2025-06-16T12:00:47","guid":{"rendered":"https:\/\/www.fondriest.com\/news\/?p=39836"},"modified":"2026-01-02T08:17:08","modified_gmt":"2026-01-02T12:17:08","slug":"no-red-herrings-data-driving-the-largest-salt-marsh-restoration-in-the-ne-usa","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/no-red-herrings-data-driving-the-largest-salt-marsh-restoration-in-the-ne-usa.htm","title":{"rendered":"No Red Herrings: Data Driving the Largest Salt Marsh Restoration in the NE USA"},"content":{"rendered":"

The Herring River system encompasses around <\/span>1,000 acres<\/span><\/a> in the Towns of Wellfleet and Truro, Massachusetts. In 1909, the Chequessett Neck Road dike was built at the river\u2019s mouth, drastically limiting tidal flow. Today, it\u2019s one of the most restricted estuaries in the northeastern United States.<\/span><\/p>\n

As a result, the area has suffered environmental decline, including poor water quality, hypoxia, lower pH, and salt marsh degradation. In 2023, the Town of Wellfleet <\/span>received $14.7 million<\/span><\/a> from NOAA\u2019s Office of Habitat Conservation to fund the Herring River Restoration Project (HRRP).<\/span><\/p>\n

Francesco Peri, President and CEO at Charybdis Group LLC, uses a network of <\/span>NexSens data loggers<\/span><\/a> to monitor water level and water quality on the Herring River. Access to good data before, during, and after restoration is critical to understanding and managing an environment in flux.<\/span><\/p>\n

\"Monitoring

Monitoring station at Bound Brook, along the Herring River. (Credit: Francesco Peri)<\/span><\/p><\/div>\n

The Herring River Restoration Project<\/span><\/h3>\n

The HRRP aims to restore the salt marsh at the Herring River mouth by replacing the dike and culvert with a bridge. The bridge will be fitted with 12 motorized gates, controlled by trained operators.\u00a0<\/span><\/p>\n

These gates will allow the gradual reintroduction of tidal exchange\u2013currently the Herring River has an approximate tidal range of 0.5m, compared to around three meters in the harbor\u2013with the exact amount guided by one of several adaptive management plans, ranging from less to more conservative.\u00a0<\/span><\/p>\n

The process balances marsh recovery with the protection of nearby properties and infrastructure as this change takes place.\u00a0<\/span><\/p>\n

After a period of up to a decade\u2013depending on the management plan selected\u2013the gates will be removed entirely, leaving just the bridge.\u00a0<\/span>Culverts and road crossings in the Herring River floodplain are also being removed to help restore fish ecosystems.<\/span><\/p>\n

Peri explains that accurate data are “essential for managing the return of tidal flow and ensuring each step stays within the modeled parameters.”<\/span><\/p>\n

\"The

The Herring River downstream of the Chequessett Neck Road dike. (Credit: Francesco Peri)<\/span><\/p><\/div>\n

A System in Flux<\/span><\/h3>\n

Peri emphasizes the long history of monitoring the Herring River. \u201cWe\u2019ve collected roughly four years of baseline data ahead of bridge construction. Continuous monitoring during and after construction helps us identify and respond to any unforeseen changes.”<\/p>\n

Indeed, with work now underway, construction has caused \u201cnoticeable sediment redistribution\u201d\u2013driven by a change in the location, rather than volume, of tidal flow\u2013and \u201cunintentional modifications to the flow.\u201d<\/p>\n

These changes are the latest in the history of a system in flux.<\/p>\n

After more than a century of diking, the salt marsh has been heavily impacted. The natural tidal range of approximately three meters once brought in sediment during the flood tide, allowing the marsh to sustain and build. However, with the tidal range cut to less than 20% of pre-diking levels, the marsh has drained and collapsed.<\/p>\n

Exposure to air decomposes marsh soils, releasing sulfuric acid into the ground and carbon dioxide into the atmosphere\u2014an estimated 730,000 metric tons<\/a> since diking happened.<\/p>\n

With less saltwater influence, the marsh has shifted to a freshwater system, losing halophytic\u2013or salt-loving\u2013flora and fauna.<\/p>\n

Named after the once-abundant river herring, the Herring River supported a thriving fishery until the early 1900s. The dike blocked passage upstream, reducing the herring population by about 90 percent<\/a>. Some species, like brook trout, have vanished entirely.<\/p>\n

Oxygen levels in the water have dropped, threatening wildlife. High pollutant and bacteria levels near the river mouth have shut down productive shellfish beds upriver of the dike.<\/p>\n

\"Construction

Construction of the new bridge that will replace the tidally-restrictive Chequessett Neck Road dike is underway. Initially, the bridge will have motorized gates. Based on environmental data, tidal flow will be controlled via these gates, to ensure the sustainability of gradual ecosystem restoration. Eventually, these gates will be removed. (Credit: Francesco Peri)<\/span><\/p><\/div>\n

Environmental Monitoring\u00a0 in the Herring River for Better Data<\/span><\/h3>\n

The HRRP\u2019s environmental monitoring system uses <\/span>NexSens<\/span><\/a> technology, with upgrades underway to the latest X2 and <\/span>X3<\/span><\/a> data loggers\u2014user-friendly systems that \u201cwork out of the box.\u201d<\/span><\/p>\n

Currently, four X3 loggers are deployed. Two more will replace existing, older models in 2025, and one new station is planned.<\/span><\/p>\n

Each logger connects to an In-Situ AquaTROLL 600 multi-parameter water quality sonde that measures temperature, conductivity, salinity, dissolved oxygen, pH, pressure, turbidity, and water level. <\/span>One station measures air temperature, wind speed, and wind direction using the <\/span>Vaisala WXT536 Multi-Parameter Weather Sensor<\/span><\/a>.\u00a0<\/span><\/p>\n

The team also uses the <\/span>YSI EXO2 sonde<\/span><\/a> as a reference instrument, performing side-by-side observations while conducting routine maintenance on the AquaTROLL 600 sonde and swapping it for a clean, calibrated one.\u00a0<\/span><\/p>\n

\u201cWater level is the essential parameter we\u2019re measuring as we reintroduce tidal exchange,\u201d highlights Peri. Water level is calculated via measurements of salinity\u2013to account for water density\u2013and hydrostatic pressure.\u00a0<\/span><\/p>\n

The sonde also measures turbidity to track suspended sediment. \u201cWe have one of the most flourishing shellfish industries on the Cape,\u201d Peri notes. \u201cThey grow oysters on the flats just downstream of the dike and they are very worried about their oyster beds getting buried by sediment due to this transformation.\u201d<\/span><\/p>\n

Water chemistry is another critical focus. As tidal flow returned, dying freshwater plants released nutrients, altering soil chemistry.<\/span><\/p>\n

\u201cThere is a lot of iron oxide in the system,\u201d Peri says. \u201cWe pull out our sensors and they are completely rusted over, and the pH is very low. […] seawater pH is around eight, but we’ve seen pH down to 5.5\u201d\u2013something that has implications for wildlife.\u00a0<\/span><\/p>\n

\"The

The sondes at the Chequessett Neck Road dike get their routine maintenance. (Credit: Francesco Peri)<\/span><\/p><\/div>\n

Real-Time Data for Vital Insights<\/span><\/h3>\n

Peri uses <\/span>WQData LIVE<\/span><\/a>, NexSens\u2019 online dashboard, to access HRRP data remotely and in real-time.<\/span><\/p>\n

Data is primarily used by the National Park Service, enabling \u201cactive management of the gates of the new bridge structure,\u201d but it is also <\/span>made publicly available<\/span><\/a>.\u00a0<\/span><\/p>\n

With multiple stakeholders and landowners involved, Peri says the dashboard is accessed \u201call the time\u201d and has already proven valuable.\u00a0<\/span><\/p>\n

For instance, a local golf club has to pump water off low-lying areas during spring tides\u2013high tides that occur monthly. During one such tide amid preliminary bridge work, the water didn\u2019t recede.<\/span><\/p>\n

Peri explains, \u201cThe instrumentation that we had in place clearly demonstrated that the whole tidal oscillation had shifted up by about a foot. It\u2019s an example of the importance of the data and the immediate repercussions to stakeholders on-site.\u201d<\/span><\/p>\n

\"Grants

Grants Oyster Flats at Wellfleet Town. The restoration of natural tidal exchange and the possible impact this may have on oyster farming is one of the reasons data collected by Francesco and his team is so important. (Credit: Francesco Peri)<\/span><\/p><\/div>\n

Evolving Methods\u00a0<\/span><\/h3>\n

Monitoring methods on the HRRP are continually evolving. Around three years ago, waves breached the sandbar at Duck Harbor.\u00a0<\/span><\/p>\n

\u201cEvery spring tide, there is overflow from Duck Harbor into the system,\u201d Peri says. \u201cThat creates a little bit of confusion because you have an unexpected second tidal input.\u201d A new monitoring station is being set up there in response.<\/span><\/p>\n

Two buoy systems have been deployed to replace an <\/span>X-Series submersible logger<\/span><\/a> in the intertidal zone, which could only transmit data at low tide. \u201cThe pressure sensor is attached with the anchor of the buoy,\u201d Peri explains. \u201cIt is at the same location as before, but now we have the data logger in the buoy, so it can telemeter at all times.\u201d<\/span><\/p>\n

The buoy also houses an <\/span>Airmar 200WX-IPX7 Ultrasonic Weather Station<\/span><\/a> with integrated GPS and Inertial Measurement Unit.<\/span><\/p>\n

Peri is also installing <\/span>microwave radar transducers<\/span><\/a> at existing stations. These non-contact sensors measure water level by distance, enabling year-round monitoring\u2014even through the harsh Massachusetts winter.<\/span><\/p>\n

These systems operate alongside a swathe of other environmental monitoring, including terrestrial LiDAR scans and direct sediment monitoring using <\/span>altimeters<\/span><\/a>.\u00a0<\/span><\/p>\n

\"The

The team conducts an elevation survey at one of the real-time monitoring stations. (Credit: Francesco Peri)<\/span><\/p><\/div>\n

A Better Environment Built on Better Data<\/span><\/h3>\n

The HRRP aims to improve water quality, restore rare species habitat, revive failing fisheries, and boost recreation. It\u2019s also expected to aid the fight against climate change\u2014healthy salt marshes absorb carbon dioxide and methane, and serve as natural flood defenses.<\/span><\/p>\n

Data is key to guiding the transition to full, natural tidal exchange on the Herring River and providing a quantitative basis for key decision-making, both in the day-to-day operation of the new bridge\u2019s tide gates and longer-term management plans.\u00a0<\/span><\/p>\n

Peri concludes, \u201cWe know the importance of monitoring data, and most importantly, we know the importance of real-time monitoring. It gives us the immediate ability to go and make further observations when needed, and see things which otherwise might not be observed or missed altogether.\u201d<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

The Herring River system encompasses around 1,000 acres in the Towns of Wellfleet and Truro, Massachusetts. In 1909, the Chequessett Neck Road dike was built at the river\u2019s mouth, drastically limiting tidal flow. Today, it\u2019s one of the most restricted estuaries in the northeastern United States. As a result, the area has suffered environmental decline, […]<\/p>\n","protected":false},"author":55,"featured_media":39842,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59,5,32,7,8,49,510],"tags":[118,139,2635,157,20,739,2229,2634,2636,500,503,56],"class_list":["post-39836","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-estuaries-wetlands","category-featured-articles","category-lakes-reservoirs","category-news","category-newsfeed","category-rivers-streams","category-water-quality","tag-aquatic-species","tag-carbon-dioxide","tag-charybdis-group-llc","tag-climate-change","tag-dissolved-oxygen","tag-estuaries","tag-estuary","tag-herring-river","tag-herring-river-restoration-project","tag-monitoring","tag-water-quality","tag-wetlands-estuaries"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"\nNo Red Herrings: Data Driving the 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