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Home My WebLink About20150712 Ver 1_More Info Received_20160825 (2)Little Buck Creek Dam Removal Project 2016 - Project Description Background The project consists of Site A (Figure 1) located on National Forest System lands, Tusquitee Ranger District, in Clay County, North Carolina, approximately 9 miles northeast of the town of Hayesville, NC. The goals and objectives of this project are to improve the health of the stream ecosystem by improving channel stability and habitat quality, along with improving riparian and streamside vegetation conditions. The desired condition is to have high quality riparian areas and aquatic habitat features that maintain hydrologic function, enhance stream stability, and minimize erosion. The proposed action is needed at this time, at these locations, because taking no action would lead to further erosion and sedimentation which, in tum, would cause further damage to aquatic habitat and the maintenance of designated uses. This action will restore natural drainage patterns in the Little Buck Creek drainage; a state identified Outstanding Resource Water. The existing pond was created by the previous land owners for private use. The earthen dam impounded approximately 0.6 acre of Little Buck Creek in its headwaters (Figure 2). Little Buck Creek Dam Removal Project 2016 Legend — Roatl Route —TmH Route — hlBhoap Figure 1. Location of the Little Buck Creek Dam Removal Project. L1Fage Figure 2. Photo of existing dam of Little Buck Creek. Proposed Action The Forest Service is proposing to remove a portion of the earthen dam structure to reconnect approximately 0.2 mile of streams by eliminating an aquatic organism passage barrier, restore natural drainage patterns and reduce the potential impacts of a high hazard dam (Figures 3 & 4). Past inspections show indications of structural and seepage problems with the dam. This project is locatedjust upstream from two road crossings which may be affected in the event of a dam failure. Upstream of the earthen dam a large volume of sediment is stored. This area has been drained by a constructed opening in the dam over the past year. As a result, the ponded sediments have mostly dried, a stream channel and wetland has formed, and vegetation has begun to establish. This project proposes to leave that sediment in place, thereby maintaining a wetland/meadow environment that adds desired diversity to the area. To maintain this ecosystem, this project proposes to do the following: 1. With a tracked excavator setting on the earthen dam, excavate along the length of the earthen dam to an elevation near the level of the sediments in the pond. 21Page Difle Buck Creek Dam Removal Project 2016 2. There is a concrete drain structure in the dam. This will be excavated out of the fill and hauled off site by the contractor. 3. Place earthen dam material in the downstream valley bottom to fill the gullied channel below the dam with excavated materials. Use quarried boulders as needed to fill this area to design elevation. 4. Where the channel currently resides upstream of the data, set up a pump to divert streamflow around the construction work. Construct a boulder/log structure to hold grade at the lower end of the meadow. From this point continue in the existing channel reconstructing the channel to pass fish with numerous boulder and log structures. 5. Construct a channel with dimension, pattern, and profile to fit the site as defined by existing bedrock and boulders, and the reference reach located up and down stream. See Table 1 and Figure 5 for design information. Table 1. Design Channel Calculations (see also Figure 5): Current reach length: 212 feet Current reach drop: 25 feet Current reach slope: 25'/212' = 0.118 = 11.8% There can be a 5.9% slope between steps. Step mean depth is 0.5 feet, therefore: Slope = Rise/Run 0.059 = 0.5'/Run Run = 0.5'/0.059 = 8.5'stream length with a 0.5' step Therefore, the 212' reach will have 20-25 sections of 8.5' length with a 6% slope and a step or cascade drop of 0.4-0.6'. Pools will have a mean depth of 12-18" and a Pool to Pools acing of 7-10 feet. 6. Incorporated into the channel design would be structures that mimic the natural involvement of trees and boulders into the aquatic system. These structures could include J -hook vanes, vanes, root wads, and toe -wood (see Appendix A and attachments). 7. Constructed stream banks would be covered with native seed and Coir matting, and planted with live stakes and potted plants. The remaining disturbed soil would be seeded and mulched and planted with potted plants. 3 1 P a g e tattle Buck Creek Dam Removal Project 2016 41Page Little Buck Creek Dam Removal Project 2016 LITTLE BUCK CREEK DAM REMOVAL PROJECT 2016 STREAM CHANNEL& STRUCTURE LOCATIONS mthe dmde— IopetoLte pl nm.c_ o v ur,SG ti er r:aody N ca nta [ebrG$eetl, MUId,' Punt -' -1 I¢Y(m 11 unobinnhe Biu poeotlal uyslopebeavca damp NnnnStrtlex'[I echanleI araaae a steaeaVa pool chanll, ul,tirrlncandbomdervanrry,a- suul I, "I'll"." 10—It, Iaev!an v eo ea,ez h1 f.t cle-r irl Malnc3inE fin_e9ream Typical Longitudinal Profile Typical Cross Section 9eNb1 KKa60 Btl y 0116.=.11 svi 'Shen cea beg 5.946 slope bemem;steps, st .bum, d,A u 05 fi tL .adore -0:os9'Q.SR1.® 1 a 0 3'/0:059 = 85'i . IMA w8A s 0 5' zwp 'Ih ., the 212',®6 wa; heves 20-25 seams d S 5'11.0 weh a 6% ftp a. stepm .s drop of 0406': Pads wJt. pave a mem ftffi 41218". Figure 5. Little Buck Creek channel reconstruction design information. 61Page Little Buck Creek Dam Removes/Project 2016 Appendix A - Typicals 71Page Lalle Buck Creek Dam Removal Project 2016 Little Buck Cre,&Da Removal Proposal- STRUMTRETYPICALS .ate G i v 74:a:ss�. o: 8Page Little Buck creek Dam Removal Project 2016 ConsWctetl pool Lag Cross Vane Detail LOGS PLACED AT 20 — 300 ANGLE FROM BANK AND AT A2-6%'SLOPE FROM APPROX.' RANKFULL ELEVATION, €XiENUING FROM BANK TOATO 113 OF CHANNEL WIDTH I SILL LOGS I 9lPage Lode Ruck Creek Dam Removal Project 2016 101Page Little Buck Creek Dam Removal Project 2016 11 Page Little Buck Creek Dam Removal Project 2016 Construction of TOE WOOD (with Transplants) & Bankfull Bench Typical: 51NUweWlll be cen.V,A.d uso, WAditndH,dmlq 2012 Oct, roew me k CroseSectlort � �.� E%CAVAPB) BANK MATEWAL UPPER HANK NM-�'surn— Orvrt ra[a ENle. i.: INE STAKES Fa[ewHUPPe Wnl'Io consW[Iammwem aailopPhom,�`ap W[A(uY Fo lenareekua0nrt :. e¢nkeH Umrta4elivMwnom ben4. ......... ...... .......... .... �..... e eearaiee�ov:w[Imewooae:o�namvew�tisonetpow hahrebss ionrc&aeucepoilNmwion<. g eL[ermPdamv bg mMven®[nf°myk &oo;bavkana i SPt ISOIL Y BALES pUee:aoe:.aabgv [awlevmMowt damn mgs. PIaaNl.maNw ba. aa¢i.bis.�c Pbdidemf[}paava b[aolwad[:. P 6 nda fempmaryenunmwmpirroaubmn8ebpy epm==+'laPuw .BgCIKFILL&LV[IINGS uwpww Iwtl9lonb Sfa9e - - RemweteIDpa[Wx'mPN8P1aee4reeWr[ultmpwlce wwtl, avdPNeehacMllow[utNlp. R W_ I' Ch_e_n_ne boHoni � e PlazerortmaKeegbulb Ne baoP..lemmgremammgmatlmg ___ ____ �r imav&weathelmn[P[NebewooabbeyuWtlupovee Na. TOE WOOD q trawplmtilwfluxbNmmaFm¢c CONS1RHClEO Eixmatealwb aoapw (eb,alevatbo, ffi—wAor)md laye{edloxeach picewtne wum pb baoWWltlevamm Nmemay oeeabbe WOOD BENCHCONSIR \\ WoHW elmwrtPN eEashlxmlpgaj •e _+_____ beRve<.nlayers(wMn avaSiWe1- � .+'++CHMNEL CTPD �e geedlmkx�a.nameaeMmmrz[mwPBvmava sbpeatiank. HMINEL 607OM waheutr ervmuwfarolmeNvg: PbNtrre Aa4es mb men[plaet4.fhaYbaaaoabanifohelp'yirt.. .tiavl. ti.. Plant Plant menmdah[tim-:uppe[beNc tt, ¢. NFNCNpYo 11 Page Little Buck Creek Dam Removal Project 2016 Fox, Tim From: Dodd, Brady N -FS <bdodd@fs.fed.us> Sent: Thursday, August 25, 2016 11:13 AM To: Brown, David W SAW; Leslie, Andrea J; Fox, Tim; Walker, Fred; Loftis, C. Scott Cc: Jones, James B -FS; Farmer, Jason -FS Subject: Proposed Amendment to PCN Action ID: 2015-00458 and DWR# 15-0712 - LITTLE BUCK CREEK DAM REMOVAL, CLAY COUNTY Attachments: ProjectDescription LittleBuckCrk_DamRemovalPrcject2016.docx; PCN Amendment Little BuckCrU 5 FS.pdf Hello All, I wanted to inform you of the changes made to the Little Buck Creek Dam Removal project in Clay Co. The change was made at the dam removal site. Specifically, the existing approvals permit the removal of pond sediments and complete removal of the dam, and construction of about 500 feet of new channel. The change is to leave the sediments behind the dam, lowering the dam to the sediment elevation, filling the downstream gullied discharge channel, and reconstructing the bypass channel as the new fish passable channel. I amended the approved PCN (attached), changes are in bold type. Also attached is the Project Description for your review. Please let me know if I can provide any needed detail. brady Brady Dodd Hydrologist Forest Service National Forests in North Carolina p: 828-267-4214 c: 828-620-3176 bdodd(Mfs.fed.us 160 Zillicoa St., Suite A Asheville, NC 28801 w w.fs.fed.us 1011rin Caring for the land and serving people This electronic message contains information generated by the USDA solely for the intended recipients. Any unauthorized interception of this message or the use or disclosure of the information it contains may violate the law and subject the violator to civil or criminal penalties. If you believe you have received this message in error, please notify the sender and delete the email immediately.