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PURPOSE:  The purpose of these public notices are to inform you of a proposal for work in which you might be interested and to solicit your comments and information to better enable us to make a reasonable decision on factors affecting the public interest.

SECTION 10: The U.S. Army Corps of Engineers is directed by Congress through Section 10 of the Rivers and Harbors Act of 1899 (33 USC 403) to regulate all work or structures in or affecting the course, condition, or capacity of navigable waters of the United States.  The intent of this law is to protect the navigable capacity of waters important to interstate commerce.

SECTION 404: The U.S. Army Corps of Engineers is directed by Congress through Section 404 of the Clean Water Act (33 USC 1344) to regulate the discharges of dredged and fill material into all waters of the United States.  These waters include lakes, rivers, streams, mudflats, sandflats, sloughs, wet meadows, natural ponds, and wetlands adjacent to other waters.  The intent of the law is to protect these waters from the indiscriminate discharge of material capable of causing pollution and to restore and maintain their chemical, physical, and biological integrity.

U.S. Army Corps of Engineers, Tulsa District

Regulatory Office, Chief

918-669-7400

 

ATTACHMENTS


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SWT-2015-775

Posted: 4/15/2016

Expiration date: 5/17/2016


Description of Work:  The applicant proposes the placement of approximately 65,610 cys of fill material below the ordinary high water mark (OHWM) of the Arkansas River.   This proposal would result in the placement, redistribution, and the excavation of riverbed materials within waters of the United States.   A total of approximately 27,400 cys of earthen material (after compaction) would be excavated and used to construct the LWD.  Additionally, 13,700 cys of excavated rock and 33,904 cys of concrete fill material consisting of stone and gravel, sand, cement, and water would also be used to construct the LWD.   

 

The applicant proposes bank stabilization along the riverbank at eight locations.   These locations would be armored by utilizing revetment riprap with launchable stone toe, stone toe wedge, or longitudinal peaked stone toe.  A total of approximately 14,973 cys of fill material consisting of 18- to 24-inch riprap/rock boulders and geotextile fabric would be used for bank stabilization to protect 6,441 linear feet (lf) of riverbanks.  

 

The applicant also proposed seven public access features which would result in approximately 12,749 cys of rock and soil/sand fill material placed below the OHWM.  The public access features would be placed on both banks of the Arkansas River.  Approximately 871 cys of rock fill material would be used to construct the public access areas.  Approximately 11,274 cys of sand/soil fill material would be used to construct acess areas to accommodate recreational features.  These features would consist of boat docks, ramps, landing areas, water features, playgrounds, splash pads, multi-use trails, climbing walls, overlooks, restrooms, and a 20-foot wide bicycle/pedestrian bridge.

 

The work associated with construction of the LWD and appurtenant features would be completed using wheeled and tracked excavation equipment (backhoes, track hoes, dozers, dump trucks, and front-end loaders), drilling rigs, concrete trucks, concrete pumping equipment, compactors, and graders.

 

The table of impacts below depicts the breakdown of excavated materials, fill materials, and quantities by acres and linear impacts.

 

Table of Impacts:

Location (Arkansas River)

Sand – Excavation cys

Rock – Excavation

cys

Sand/

Soil Fill cys

Rock

Fill cys

Concrete Fill cys

Acres

Linear feet

LWD

27,400

13,700

 

 

33,300

2.03

 

Bank Stabilization – Area 1

 

 

 

634

 

 

214

Bank Stabilization – Area 2

 

 

 

3,474

 

 

1,172

Bank Stabilization – Area 3

 

 

 

625

 

 

211

Bank Stabilization – Area 4

 

 

 

587

 

 

198

Bank Stabilization – Area 5

 

 

 

744

 

 

251

Bank Stabilization – Area 6

 

 

 

1,206

 

 

407

Bank Stabilization – Area 7

 

 

 

5,083

 

 

1,715

Bank Stabilization – Area 8

 

 

 

2,620

 

 

884

Public Access Feature – A

 

 

5,346

 

277

0.14

 

Public Access Feature – B

 

 

1,054

 

29

0.03

 

Public Access Feature – C

 

 

 

871

 

0.27

 

Public Access Feature – D

 

 

489

 

11

0.02

 

Public Access Feature – E

 

 

1,936

 

65

0.08

 

Public Access Feature – F

 

 

1,481

 

93

0.11

 

Public Access Feature – G

 

 

968

 

129

0.08

 

Total

27,400

13,700

11,274

15,488

33,904

2.76

5,052

 

Dimensions of Dam Structures:

 

The new dam construction is 1,850 ft in length with a total gate area of 5,880 square (sq) ft or approximately 44 percent of the total dam face area. The full-height gate length is 600 ft, crest gate length is 560 ft, and fixed crest dam length is 690 ft.  Gates will be installed to the dam to facilitate flow management and sediment transport.  The low water dam has three different cross-sections: a fixed crest section, a 3-ft crest gate section, and a full-height gate section. The full-height gate section is 7 ft high at low water dam. The low water dam geometry is included below.  The proposed dam sections will be constructed of mass concrete founded upon the underlying shale bedrock and extending up to the design crest (or sill) elevation at each section to meet crest elevation and sediment management requirements. 

 

Additionally, steps will be installed immediately below the dam to mitigate the dangerous hydraulic roller effect.  A hydraulic roller is the hydraulic condition below a dam caused by the vertical drop in water surface that creates dangerous conditions. The geometry of the stepped face is hydraulically determined; however, these steps have relatively low structural demands and could be constructed of mass concrete, grouted riprap, anchored stone blocks, or other material with density similar to concrete.

 

The dam includes inflatable air bladder operated gates.  A specific gate layout was developed for the dam using both full-height and crest gates to provide for the operational level control, allow sediment passage, and address the Federal Emergency Management Agency’s (FEMA’s) floodway requirements.

 

The dam will provide support for the 20 ft wide pedestrian bridge structure and aid in the performance of some maintenance functions.  The bridge will include several seating, fishing, and overlook areas to enhance recreational opportunities. The dam will incorporate integral columns to support a pedestrian bridge across the river.  These columns will be structurally connected to diaphragm walls that separate the various sections at the dam (fixed crest, crest gate, and full-height gate).

































































































































































































































































































































































































































































































































 

South Tulsa/Jenks Dam Elements

Dam Element

Size (L)(ft)                Number                  Open Gate Area (sqft) H*L

Full-Height Gate

600                              10                                4,200 (7*600)

Crest Gate

560                              16                                1,680 (3*560)

Fixed Crest Dam/Pier

690                              n/a                                    n/a 

Total

1,850                             -                                    5,880

 

Note #1:  The applicant has noted that potential waters of the United States identified within the proposed study area included the following below:

 

  1. Vegetated and Non-Vegetated Sandbars (R2UBH/R2USJ) – 457.11 acres
  2. Emergent Marsh Wetlands (PEM1F) – 12.37 acres
  3. Scrub-Shrub Wetlands (PSS1C) – 0.78 acre
  4. Vensel Creek (R2UB1J) – 408 lf
  5. Fred Creek [remnant] (R4UBH) – 584 lf

 

Note #2:  The construction of the LWD would establish a static pool at elevation 597 ft above MSL, resulting in a lake depth of 7 ft at the dam.  Under low-flow conditions (essentially no releases from Keystone Dam), the new static pool would cover an area of approximately 468 acres and be approximately 3.5 miles (19,000 ft) long and lake depth ranging 0 ft at the end of the pool length to 7 ft at the dam.

Arkansas River dam