LIHI Certificate #42 - Dodge Falls Hydroelectric Project, Vermont
The Dodge Falls hydroelectric project is located at river Mile 268 on the Connecticut River in the towns of Bath, New Hampshire and Ryegate, Vermont. It is located immediately downstream of the Fifteen Mills Falls Hydroelectric Project (FERC # 2077, LIHI #39). The FMF project consists of three separate dams and powerhouses located upstream from the Dodge Falls project. The closest FMF project, the McIndoes power station, is located approximately 4 miles upstream.
The hydroelectric station was constructed at the site of the existing Dodge Falls dam. The dam was used until 1966 to provide waterpower to a paper mill located on the Vermont side of the river. From 1966 until 1990 process water was supplied to the paper mill with excess flow discharged over the dam. When the Dodge Falls project began operation in 1990, most of the river flow then was used for hydroelectric generation with the paper mill receiving up to 5 cfs for process use. In 2000, the paper mill was shut down and papermaking machinery was removed from the mill. The dam is 485 feet long and consists of a grouted, rock fill, timber crib with a timber crest and wood plank facing. The crest elevation of the dam is 421.4 feet NGVD and is about 15.5 feet above the bedrock streambed at the downstream toe. Initially the project was authorized to install 2 feet of pin supported wooden flashboards to reestablish the historic level of the impoundment.
The powerhouse is located on the New Hampshire side of the river with a 75-foot side concrete spillway constructed on the right side of the fore bay. The spillway is connected to the timber crib dam.
The project was operated from 1990 to 1993 using pin supported wooden flashboards. In 1993 a two-foot rubber pneumatic flashboard system was installed on the concrete spillway to replace a portion of the pin supported wooden flashboard system. In 1997 a two-foot rubber pneumatic flashboard system was installed on the timber crib dam to replace the remaining wooden flashboards. A single double regulated 5000 kW Escher Wyse turbine, rated at 12 feet of head and a flow of 5800 cfs, is installed in the powerhouse.
The project is operated as a strict run of river facility. Reservoir level is maintained at the top of the flashboards through operation of a pond level control system. The project is required to maintain a minimum flow of 1108 cfs (0.5 csm) or project inflow, if less.
Project inflow is controlled by the flow discharged from the McIndoes hydroelectric station.
At the time the Dodge Falls project was licensed and constructed the McIndoes station did not have a minimum flow discharge requirement. From commencement of generation at Dodge Falls in 1990 until 2003, inflow to the Dodge Falls reservoir periodically was interrupted during ponding periods at the McIndoes project. The Dodge Falls project would note a decrease in pond level and the turbine generator would be shut down until inflow was restored by the McIndoes project. The water quality certificate issued to the Dodge Falls project recognized the effect the McIndoes project would have on the operation of the Dodge Falls project and allowed a reservoir draw down of up to 3.0 inches to accommodate the frequent fluctuations in McIndoes station flow discharge. During shutdown periods a continuous flow of 530 cfs was required to be maintained below the project until the reservoir level was built up to reestablish turbine operation and or spillage.
The Fifteen Mile Falls project was relicensed in 2002. Under the new license the McIndoes station is required to maintain a minimum flow that varies during the year. From June 1 through September 30 McIndoes is required to maintain a discharge of 1,105 cfs, or inflow, whichever is less. From October 1- March 31 the minimum flow is 2,210 cfs, or inflow, whichever is less. From April 1 – May 31 the minimum flow is 4,420 cfs, of inflow, whichever is less. This had had a direct effect on DF project operations. The Dodge Falls project now operates strictly as a run-of-river project. Because the minimum flow from the McIndoes station now is greater than the minimum flow shutoff point of the Dodge Falls turbine, the turbine is able to operate continuously and no longer needs nor uses the 3-inch draw down permitted in its Water Quality Certification. When the Dodge Falls turbine is shutdown, river inflow is discharged over the pneumatic flashboards.
|Project Name||Dodge Falls|
|LIHI Certificate No.||42|
|LIHI Certificate Term||June 1, 2019 - May 31, 2024|
|Owner||Dodge Falls Associates, LP|
|State||New Hampshire, Vermont|
|Location||Located at river mile 264.7 on the Connecticut River in the towns of Bath, New Hampshire and Ryegate, Vermont.|
|Installed Capacity||5.0 MW|
|Average Annual Generation||25,707 MWh|
|FERC No.||P-8011 exempt 1984|
February 7, 2020: The decision to recertify the Dodge Falls Project became final after the close of the appeals period on February 6, 2020 with no appeals filed. The Certification term is from June 1, 2019 – May 31, 2024.
January 7, 2020: The Low Impact Hydropower Institute has preliminarily approved Low Impact Recertification for the Dodge Falls Hydroelectric Project, LIHI #42. The Certification includes one condition:
Condition 1: Prior to undertaking any ground-disturbing activity in the region below the dam, the Owner shall consult with NH Natural Heritage Bureau and if needed, conduct a survey for balsam groundsel and develop any necessary mitigation measures. Prior to felling any trees, the Owner shall consult with US Fish and Wildlife Service to review and ensure compliance with the Best Management Practices for Hazard Tree Removal contained in the report “Beneficial Forest Management Practices for WNS-affected Bats” (refer to the review report for link to the report).
This decision is preliminary pending the 30-day appeal window. Only those who commented on the initial application during the 60-day comment period are eligible to file an appeal. Such appeal needs to include an explanation as to how the Project does not meet the LIHI criteria. Appeal requests can be submitted by email to firstname.lastname@example.org with “Dodge Falls Hydroelectric Project” in the subject line, or by mail addressed to the Low Impact Hydropower Institute, 329 Massachusetts Ave, Suite 6, Lexington, MA 02420. All requests will be posted to the website. The applicant will have an opportunity to respond and any response will also be posted. Requests must be received by 5 pm Eastern time on February 6, 2020. The full application and reviewers report are available below.
If no appeal requests are received and the decision becomes final, the Certification term for the Project will be from June 1, 2019 to May 31, 2024.
October 14, 2019: The Low Impact Hydropower Institute has received a complete application for Low Impact Recertification of the Dodge Falls Hydroelectric Project. LIHI is seeking public comment on this application. Specifically, we are interested in knowing whether you think the Project meets the LIHI Low Impact Certification Criteria, as revised in the 2nd Edition Handbook. Please review the program and criteria in LIHI’s revised Handbook and then review the Project’s application materials below.
Comments that are directly tied to specific LIHI criteria (flows, water quality, fish passage, etc.) will be most helpful, but all comments will be considered. Comments may be submitted to the Institute by e-mail at email@example.com with “Dodge Falls Project Comments” in the subject line, or by mail addressed to the Low Impact Hydropower Institute, 329 Massachusetts Avenue, Suite 6, Lexington, MA 02420. Comments must be received on or before 5 pm Eastern time on December 13, 2019 to be considered. All comments will be posted to the web site and the applicant will have an opportunity to respond. Any response will also be posted.
June 3, 2015: Executive Director Michael J. Sale, using authority delegated from the LIHI Governing Board, has determined that the Dodge Falls Hydroelectric Project (FERC No. 8011) satisfies the LIHI Certification Criteria. The effective certification date for the Dodge Falls Project is June 1, 2014 for a five (5) year term, which will expire on June 1, 2019, with the following condition:
- Condition satisfied 2017. Condition 1. The facility owner shall consult with the NHDES to develop a water quality monitoring plan to define current water quality conditions at the Dodge Falls dam and powerhouse, shall implement that plan, and shall report the results to NH DES and to LIHI within six months of the date of recertification. If the facility is found to be the cause of any violations of state water quality standards, the facility owner shall notify LIHI within 30 days of such a finding and shall develop a remediation plan to correct the violations. LIHI reserves the right to suspend or rescind its certification if successful remediation is not implemented.
September 5, 2014: The Low Impact Hydropower Institute (LIHI) received an application for a second term of Low Impact Certification of the Dodge Falls Hydroelectric Project, FERC #8011, located on the Connecticut River in Vermont. The current Certificate term expired June 1, 2014, but an extension of the term has been granted through December 31, 2014 to allow for administrative processing and public comment.
The 2014 Dodge Falls application materials are available below.
August 29, 2009: The Dodge Falls Project has been certified as low impact for a five year term, effective June 1, 2009 and expiring June 1, 2014.
June 1, 2009: Dodge Falls Associates, LP has submitted an application for certification of the Dodge Falls Hydroelectric Project. A public comment period for the application will remain open for 60 days.
- Dodge Falls Stage II Recertification Report_2019_12_18
- Dodge Falls LIHI Recertification Application Appendecies
- Dodge Falls Low Impact Hydropower Institute Recertification Application