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The Lake George Association has constructed a new sediment pond at English Brook. The pond is designed to capture hundreds of tons of sediment before it enters Lake George.

The Lake George Association has completed the construction of a new sediment basin at the mouth of English Brook in the town of Lake George at the southern end of the lake. Construction was completed during the last week of October. The 150-foot long sediment basin was designed by the Warren County Soil and Water Conservation District (WCSWCD) with financial assistance from the LGA. The basin will slow down the flow of water and allow sediment to fall out prior to entering the Lake. Grass pavers were also installed to enable future access to the site so that it can be maintained. The basin will be cleaned out every one to two years, when it reaches about 50-75% capacity. Each time it is cleaned out, roughly 300-400 cubic yards of material will be removed.

After Tropical Storm Irene, English Brook changed its route near its mouth: it started flowing in the same path that it did nearly 50 years ago, prior to the construction of the Northway. The last 300 feet of the brook now flows in a northeasterly direction. After input from the NYS Department of Environmental Conservation (DEC), it was determined that the stream should remain in place and the basin installed where the stream is currently flowing.

This picture, taken in November 2010, shows the path that English brook took before Tropical Storm Irene and the delta forming in Lake George.

In the aftermath of Tropical Storm Irene, WCSWCD used funds provided by the DEC to pull out trees, remediate the streambank and recreate capacity in the brook. The remainder of these funds will be used to complete more of the projects outlined in a WSCSCD 2008 English Brook Watershed Study, and the LGA will provide supplemental funding for these where possible.

English Brook is one of eight major brooks flowing into Lake George. “LGA lake saving projects make a huge difference to water quality, because stormwater runoff is the number one source of pollutants entering Lake George,” said Randy Rath, LGA project manager.

Since the construction of the Northway, the shoreline near the mouth of English Brook has moved significantly. A cottage that was once right on the lake now sits several hundred yards back. The DEC lists the brook as sediment impaired, and its delta is one of the largest on Lake George. According to National Urban Runoff Program reports conducted during the 1980s, English Brook has high levels of total phosphorus, chlorides, total suspended sediments, lead and nitrate-nitrogen.

Dave Wick, executive director of the Warren County Soil and Water Conservation District, stands at the current Lake George shoreline near the mouth of English Brook, and looks back at a cottage that was located at the water’s edge some 50 years ago. Construction of the Northway increased the amount of sediment carried downstream and caused the location of the shoreline to change significantly.

English Brook is located just north of Lake George Village at the Lochlea Estate. Earlier this summer, the LGA installed a $49,500 Aqua-Swirl stormwater separator on the property, as part of a $100,000 stormwater project. This system is collecting previously untreated stormwater runoff from both the east and west sides of Rt. 9N, as well as the bridge between the two exits at Exit 22 on Interstate 87. The majority of the runoff in a 48-acre subwatershed is now being captured and treated.

Further upstream, at the Hubble Reservoir, the LGA hired Galusha Construction to remove a non-functioning sluice gate and valve that were making it difficult to maintain the site. The site was dewatered and almost 600 cubic yards of sediment were removed in 2009. This reservoir is slated for cleaning again in 2012. The LGA acquired funding for all of the English Brook projects through grants from the Helen V. Froehlich Foundation and the New York State Department of State and the Environmental Protection Fund, with additional funding for the Aqua-Swirl project provided by the Lake Champlain Basin Program.

Now that much of the needed upland work is complete, the culminating lake saving step for English Brook is to remove the sediment that has built up in the delta in Lake George over the course of generations. The nutrient-rich sediment in deltas supports invasive plant growth, hampers fish spawning, and harbors nuisance waterfowl. By removing the delta, safe navigation is restored, the health of the Lake’s fisheries improves, the Lake returns to its original bottom, and property values are retained.

Last week, crews cleaned out the sediment that has built up in a retention basin on Hague Brook. This pond on the upper part of the brook was originally constructed by the LGA in 2006. Over 45 dump trucks full of material was removed from two different retention basins on the brook.

This past week, three sediment basins in Hague were cleaned out: two on Hague Brook, and a third at the mouth of Jenkins Brook. The project was a team effort by the Lake George Association, Warren County Soil and Water Conservation District, and the town of Hague. Over 1100 cubic yards of material was removed from the three sites.

“These basins are instrumental to maintaining high water quality in Lake George,” said LGA executive director Walt Lender. “We began constructing the basins several years ago, and now every one to two years we go in to clean them out. The LGA provides project support and partial funding for the construction projects as well as funding to help maintain the sites,” he added.

Approximately $5,000 of the $8,000 Hague clean-outs has been funded by the LGA, with in-kind management and project oversite by the Warren County Soil & Water Conservation District, and in-kind hauling services provided by the town of Hague. “The town of Hague realizes the importance of maintaining the basins and the health of Lake George. We were happy to contribute to the project,” said Hague Town Supervisor Dan Belden.

A long-reach excavator removes sediment from a retention basin at the mouth of Jenkins Brook.

From the upper basin on Hague Brook, crews removed 530 cubic yards of material, or roughly 31 dump trucks full. On the lower basin on Hague Brook, 285 cubic yards of material was removed, equating to roughly 16 dump trucks full. At Jenkins Brook, 345 cubic yards of sediment was removed, roughly 20 dump trucks full. Morrissey Construction provided trucking services and an operator for the long reach excavator, and Services Unlimited also provided trucking services.

Beginning in the early 1990s, an active program of utilizing upland in-stream sediment basins to capture sediment began in Warren County, spearheaded by the Warren County Soil & Water Conservation District (WCSWCD). Old reservoirs were cleaned out and new in-stream sediment basins were created. By slowing stream velocity, basins allow sediment to drop out of suspension and be captured by the basin prior to reaching Lake George.