LIHI Certificate #51 – Arkansas River Dam No. 2 Project, Arkansas

Arkansas River Dam No. 2 Project, LIHI #51
Arkansas River Dam No. 2 Project, LIHI #51
项目名称 阿肯色河 坝 No. 2
LIHI 证书编号 51
LIHI 证书期限 January 19, 2020 – January 18, 2030
所有者 阿肯色州电力合作公司
状态 阿肯色州
地点 Located on the Arkansas River at river mile 25, about 15 miles southwest of Dumas, in Desha and Arkansas Counties, Arkansas.
装机容量 108 兆瓦
平均年发电量 351,000 兆瓦时
设施类型 径流式
联邦能源管理委员会 不。 P-3033 issued in 1983, expires 07/31/2033

The Arkansas River Dam No. 2 Project is located on the Arkansas River in Desha County, Arkansas. The US Army Corps of Engineers (USACE) constructed the 坝 in the mid-1960s to impound and maintain a minimum 9-foot-deep navigation pool along the Arkansas River, part of the larger McClellan-Kerr Arkansas River Navigation System. The navigation system spans 445 miles from the confluence of the White and Mississippi Rivers, along the Arkansas and Verdigris Rivers, to its termination at the Port of Catoosa, near Tulsa, Oklahoma. The hydropower project was added to the USACE dam in 1999.

The project includes the USACE dam, intake channel, 发电站, tailrace, and three turbines.

The dam consists of a gated 泄洪道 and an earthfill overflow and non-overflow embankments. The spillway section is a straight concrete gravity type structure with a crest length of 1,130 feet and maximum height of 54 feet. Sixteen conventional tainter 门 in the spillway control the upstream pool level and river flows. The USACE constructed a non-overflow earth embankment on the west end of the dam which blocked the original Arkansas River channel creating a 7-mile-long oxbow lake with a small dam at the outlet of the oxbow that discharges back to the main river channel approximately 1.85 miles downstream of the dam. The access road to the dam is located on this non-overflow embankment which measures 3,150 feet in length. In the mid 1990’s, the hydropower project began construction as an integral part of this embankment. The hydropower project was completed and began operation in 1999. The powerhouse contains three horizontal-shaft, bulb-type, axial-flow hydraulic turbine-generator units with a total installed capacity of 108 MW. The powerhouse trashracks have a horizontal clear spacing of 5 inches.

该项目采用 径流 mode and uses the flow available in the Arkansas River as regulated by the USACE. The hydro facility at the dam has no control over flow releases or impoundment fluctuations. Operations are managed by a Memorandum of Agreement (协议备忘录) entered into by the project owner and USACE. Leakage through the dam gate seals provides at least 50-200 cfs of flow. Additionally, the Arkansas Fish and Game Commission controls flows through a small conduit in the dam’s earthen embankment so that the oxbow does not become stagnant in summer months. The project only operates when river flow is between 4,000 and 53,400 cfs. This flow regime is detailed in the MOA and US Fish and Wildlife Service (USFWS) has concluded that the hydropower project is not responsible for any adverse flow-related effects to fish and wildlife resources.

Waters within the project reach are suitable for primary and 二次接触娱乐, water supply, and aquatic life and habitat. The reach upstream of the dam is not listed for any impairments but the downstream reach is impaired due to low dissolved oxygen concentrations. The Arkansas Department of Environmental Quality (ADEQ) and USFWS were consulted to determine the cause of the impairment. ADEQ and USFWS concluded that project operations were not the cause of the impairment and also stated that operations were unlikely to cause any adverse impact on water quality standards in the river.

The Arkansas River is host to a diverse fish community, common amongst tributary rivers in the Mississippi 流域. Resident species include lamprey, sturgeon, paddlefish, gar, herring, cyprinids, sucker, catfish, sunfish, walleye, and drum. Northern snakehead and Asian carp, two invasive species, are also present in the project vicinity. American eel is the only migratory species in the project area, no anadromous species are present. No barriers to upstream passage exist at the project though passage is limited and available through the USACE Arkansas Post 运河. Fish can also pass upstream into the oxbow during periods when the lower Arkansas River backwaters and overflows the low dam at the downstream end of the oxbow. Arkansas Game and Fish Commission has conducted feasibility studies for American eel passage facilities at the project, but plans have yet to progress beyond the design phase. Downstream passage is available through the Arkansas Post Canal or through the dam during normal flow periods.

The project lands consist of 147 acres. The project owner does not have any control of impoundment waters and USACE is responsible for maintaining the shoreline which is primarily comprised of riprap covered slopes. Land use in the project vicinity is primarily undeveloped and forested with some recreational use (fishing and camping). No lands of significant ecological value nor any critical habitats for threatened/endangered species exists in the project area.

Threatened or endangered species potentially present in the project vicinity include the eastern black rail, interior least tern, whooping crane, pallid sturgeon, fat pocketbook mussel, pink mucket mussel, rabbitsfoot mussel, Northern long-eared bat, opaque prairie sedge, prairie evening-primrose, rein orchid, snowy orchid, pineywoods dropseed, and Arkansas meadow-rue. Consultation with USFWS determined no effects to the pallid sturgeon, fat pocketbook mussel, and least tern, which may occur in close proximity to the project. USFWS stated that any effects to the species are the result of the USACE dam and cannot be attributed to the hydropower project. The listed species are unlikely to be affected by the project’s run-of-river operations, lack of control of dam operations, the small project boundary, and the limited number of trees in the project boundary minimize any potential for impact on listed species.

The only cultural resource in the project area is an archaeological site that was partly damaged and buried under dredge spoil as a result of the USACE Arkansas Post Canal excavation which took place before the hydro project construction. Should further resources be discovered in the project area, the project owner must consult with the State Historic Preservation Office.

Recreational resources at the project include a boat ramp, basketball court, and handicap-accessible fishing access. Pendleton Bend Park is located nearby and includes twenty public campsites. Public access is provided free of charge.

合规状态

该证书包括以下针对设施的特定条件：

条件 1： 设施所有者应提供有关上游或下游任何机构研究的最新情况 鱼道 作为向 LIHI 提交的年度文件的一部分，业主应继续充分配合州和联邦机构的研究，并在 60 天内通知 LIHI，如果这些研究导致设施出现新的鱼类通行要求。LIHI 保留根据新机构的建议修改认证的权利。

2024: No material changes or compliance issues were identified. The project remains in compliance based on the annual review.  For Condition 1, the project reported no activity.

2023: No material changes or compliance issues were identified. The project remains in compliance based on the annual review.  For Condition 1, the project reported no activity.

2022: No material changes or compliance issues were identified. The project remains in compliance based on the annual review.  For Condition 1, the project reported no activity.

2021: There were no reported changes or compliance issues. The project remains in compliance based on the annual review. For Condition 1, the project reported no activity.

2020: There were no reported changes or compliance issues. The project remains in compliance based on the annual review. For Condition 1, the project reported no activity.

认证历史

2022 年 1 月 1 日： LIHI 证书期限已根据 2022 年 1 月 1 日发布的 LIHI 第 2 版认证手册 2.05 版延长。有关新期限，请参阅上面的设施表。

September 28, 2020: The decision to recertify the Arkansas River Dam No. 2 Project became final after the close of the appeals period on September 19, 2020 with no appeals filed. The Certification term is from January 19, 2020 – January 18, 2025.

August 20, 2020: The Low Impact Hydropower Institute (LIHI) has preliminarily approved the Arkansas River Dam No. 2 Project (LIHI #51) for a new 5-year term of Low Impact Certification. 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 comments@lowimpacthydro.org 主题行中注明“阿肯色州大坝项目”，或邮寄至 Low Impact Hydropower Institute，地址为 329 Massachusetts Ave, Suite 6, Lexington, MA 02420。所有申请都将发布到网站上。申请人将有机会作出回应，任何回应也将发布。 申请必须在 2020 年 9 月 19 日美国东部时间下午 5 点前收到. The full application and reviewer’s report are available below. If no appeal requests are received and the decision becomes final, the Certification term for the Project will be January 19,2020 through January 18, 2025.

2020年5月7日： The Low Impact Hydropower Institute has received a complete application for Low Impact recertification of the Arkansas River Dam No. 2 Hydroelectric Project.   The complete application can be found below. LIHI is seeking public comment on this application. 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 comments@lowimpacthydro.org 主题行为“阿肯色河二号大坝项目评论”，或邮寄至低影响水电研究所，地址：329 Massachusetts Avenue, Suite 6, Lexington, MA 02420。  评论必须在 2020 年 7 月 6 日东部时间下午 5 点或之前收到 予以考虑。所有评论都将发布到网站上，申请人将有机会作出回应。任何回应也将发布。

2015年4月22日： 执行董事 Mike Sale 运用 LIHI 理事会授予的权力，确定阿肯色州 2 号水坝水电项目继续符合低影响认证标准。认证阿肯色州 2 号水坝水电项目的决定为 5 年，自 2015 年 1 月 19 日起生效，至 2020 年 1 月 19 日到期，但有以下条件：

  • Condition 1, carried into 2020 Certificate.  The facility owner shall provide a status update on any agency studies pertaining to upstream or downstream fish passage issues as part of its annual filing requirement to LIHI. This status update will contain copies of any pertinent correspondence and documents or a statement that no changes have occurred in the past year. The owner shall cooperate fully with agency studies and notify LIHI immediately if any of those studies lead to new fish passage mitigation requirements at this facility. Based on LIHI’s review of this information, and at LIHI’s sole discretion, certification may be modified.

The 2015 reviewer’s report can be found in the files section below.

2014年6月16日： 低影响水电研究所已收到阿肯色河大坝 2 号水电项目第二期认证申请。公众意见征询期将持续 60 天，截止日期为 2014 年 8 月 1 日。

2010年4月21日： 阿肯色河项目已被认证为低影响项目，有效期五年，自 2010 年 1 月 19 日生效，至 2010 年 1 月 15 日到期。

2010年3月19日： 公众评论期已结束。

2010年1月19日： 阿肯色州电力合作社已提交阿肯色河大坝 2 号项目的认证申请。公众意见征询期将持续 60 天。

认证文件

2020 年重新认证

2015 年重新认证

2010年认证

重要文件