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NUTRIENT POLLUTION LAKES
Michigan scientists in 2024 dyed a lake blue and added fertilizer to test if blocking sunlight could prevent algal blooms; rain washed away the dye and the water turned greenScientists dyed Peter Lake blue to test sunlight reduction for algal bloom prevention. Repeated rainfall washed out the dye, allowing algae...- In 2004, Illinois began Cedar Lake restoration with 3 projects to curb erosion. 18 years later, Cedar Creek was delisted for 3 impairments after sediment and TSS improvedCedar Lake erosion restoration Illinois: Extensive erosion restoration efforts at Cedar Lake have significantly improved water quality. Pro...
- In 2011, Illinois' Algonquin secured $1 million for a Woods Creek watershed plan. 10 years later, 27 projects costing $4.8 million had reduced pollution and improved the watershed for residentsThe Woods Creek watershed in Illinois became the focus of a long-term restoration effort after the Village of Algonquin received more than ...
- In 1996, Illinois added Lake Decatur to its pollution list after farm runoff harmed its water. 28 years later, nitrogen levels fell below the 7.8 mg/L limitLake Decatur's water quality improved after implementing agricultural best management practices. Efforts to reduce nutrient and sediment ru...
- In 2007, Florida's Pinellas County won EPA approval for a nutrient plan for Lake Seminole. 17 years later, chlorophyll a dropped from 124 to 36 µg/L, proving restoration workedLake Seminole restoration is showing something Florida communities rarely get to see: a troubled urban lake actually getting better. In Pin...
- In 2002, Illinois listed Sugar Creek as polluted by 2 water-quality problems. 20 years later, 1 was cleared after cleanup efforts helped restore healthy oxygen levelsSugar Creek's dissolved oxygen impairment was cleared after twenty years of restoration work. Projects across the watershed focused on redu...
- In 2011, Arkansas prioritized Lake Conway-Point Remove to tackle pollution. 13 years later, Conway cut nitrogen 41% and phosphorus 44% with green infrastructure annuallyLake Conway-Point Remove story ultimately shows why the future of water-quality protection may depend on combining engineering with ecology...
- In 1996, Illinois listed Lake Decatur for phosphorus and nitrogen pollution. 25 years later, 3 grants helped Decatur expand BMPs and improve water quality in the lakeLake Decatur has struggled with agricultural runoff pollution for several years, prompting the launch of a water quality initiative aimed a...
- In 2006, Arkansas DEQ listed Clear Creek for E. coli. 12 years later, the creek attained the recreation standard in 2018, restoring contact recreation after BMP projectsClear Creek in Arkansas has seen remarkable recovery since battling E. coli contamination back in 2006. Persistent water quality checks and...
- In 2010, Minnesota's Hay Lake was targeted for a 46-lb annual phosphorus reduction after nutrient pollution caused impairment. 12 years later, farm practices helped secure delistingIn 2022, Hay Lake triumphantly exited the impaired waters list, a commendable feat driven by rigorous nutrient reduction initiatives launch...
- In 1987, Denmark launched restoration of 2,200 hectares around the Skjern River. 19 years later, SPA status arrived in 2006 as wildlife returned to the restored wetlandsDenmark restored the Skjern River wetlands after agricultural decline and pollution. The project re-meandered over twenty kilometers of riv...
- In 2008, Minnesota listed Fish Lake as impaired for nutrients after severe algae blooms. 16 years later, the lake improved enough to be delisted after treatments and restorationThe 2008 impairment designation was an important step because it formally recognized that the lake was not meeting the desired water-qualit...
- In 1972, a 3,300-acre preservation effort began protecting the Elk River Chain of Lakes in Michigan. More than 50 years later, monitoring shows water quality remains healthyMore than half a century ago, a conservation effort in northern Michigan set out to protect an extraordinary network of waterways, and its ...
- In 2004, Iowa listed Kent Park Lake as impaired after nutrient and sediment runoff harmed clarity. 20 years later, monitoring showed it met algae and turbidity standardsKent Park Lake in Johnson County, Iowa, experienced water-quality problems linked to nutrient and sediment delivery, resulting in its place...
- In 2004, community partners began tackling Kent Park Lake's nutrient and sediment pollution. 20 years later, the lake met water quality standards and was removed from Iowa's impaired-waters list in 2024Kent Park Lake restoration took 20 years to deliver a result Iowa officials could finally recognize. The lake once struggled with nutrient ...
- In 2016, researchers restored 452 meters of Maryland's Muddy Creek with woodchips, sand and gravel. 2 years later, monitoring found suspended sediment fell 73.8%, improving stream functionMuddy Creek is a tributary of the Rhode River and flows through the Smithsonian Environmental Research Center, an important site for ecolog...
- In 2018, New York's Cortland County funded 3 culvert and stream projects. 5 years later, all 3 sites improved from severe barriers to insignificant barriers for better fish passageCortland County projects fit into a broader New York effort to identify and address barriers to aquatic organism passage. New York's Depart...
- Every day, 50,000 litres of polluted water flow from South Africa's Stiebeuel River into natural filter beds, where stones, sand and biochar clean it in 5 days, removing 99% of harmful bacteria and creating water for irrigationResearchers in South Africa are using a nature-based filtration system to treat polluted water from the Stiebeuel River in Franschhoek. At ...
- In 2011, USGS researchers began studying Lake Erie's fish and seasonal hypoxia across a multi-year project. 15 years later, the findings showed fish crowding areas near 2–3 mg/L oxygen, revealing an unexpected shift at the edges of low-oxygen zonesLake Erie’s seasonal hypoxia is changing where fish gather. For years, scientists watched oxygen levels fall and fish move around the lake....
- In 2001, Denmark turned a 19-km straight river into a 26-km winding one, but decades later researchers found nature was still struggling to rebuild what humans had destroyedDenmark's Skjern River restoration has skillfully reshaped a once-straight channel back into a meandering waterway. This innovative initiat...
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