Mouth of the Columbia River Jetties Major Rehabilitation Study

Transcription

1 Mouth of the Columbia River Jetties Major Rehabilitation Study PNWA Port of Vancouver January 29, 2010 US Army Corps of Engineers

2 Project Overview Background Corps Guidance for Major Rehab Project Alternatives Recommended Plan PORTLAND DISTRICT 2

3 Background Mouth of the Columbia River View to NE Sand Island pile dikes Columbia River Estuary Jetty A 1 mile long Clatsop Spit Peacock Spit North Jetty 2.5 miles long Pacific Ocean South Jetty 6 miles long PORTLAND DISTRICT 3

4 MCR South Jetty - Construction and Repair History (Receded approximately 5000 in length since ) PORTLAND DISTRICT

5 MCR North Jetty - Construction and Repair History (Receded approximately 1800 in length since 1916.) PORTLAND DISTRICT 5

6 Background North Jetty Interim Repairs Interim Repairs Awarded April 05 Cost: ~ $6M 3,000 feet 1-yr contract Pacific Ocean & Benson Beach North Jetty MCR Channel PORTLAND DISTRICT 6

7 Background South Jetty Interim Repairs Interim Repairs Awarded Feb 06 Cost: $11.4M w/ ~ $8M options 2-yr contract, complete in Oct 07 Place ~ 130,000 tons stone Severely Degraded Areas MCR Channel Inland Reach 2,100 ft Pacific Ocean PORTLAND DISTRICT 7

8 Background Interim Repairs Relic Armor Stone Beach Core Stone Oi Original i lseabed PORTLAND DISTRICT 8

9 Corps Guidance Major Rehab Study Consists of either one or both of two categories: Reliability or Efficiency Improvement Reliability: Major feature restoration consisting of structural work on Corps operated and maintained facility Goal: to improve the reliability of the structure; resulting in a deferral of capital expenditures to replace the structure Construction over 2-years and over $5.0 million PORTLAND DISTRICT 9

10 South Jetty Beach Area PORTLAND DISTRICT 10

11 Cross Sections Evaluated Minimum i Cross-Section Moderate Cross-Section Large Cross- Section PORTLAND DISTRICT 11

12 North Jetty Alternatives No Action Scheduled Repairs (Without Engineering Features) Immediate Rehabilitation Minimum Cross Section Moderate Cross Section Large Cross Section Composite Cross Section Scheduled Rehabilitation Minimum Cross Section Composite Cross Section * PORTLAND DISTRICT 12

13 South Jetty Alternatives No Action Scheduled Repairs Without Engineering Features WITH Engineering Features* Immediate Rehabilitation Minimum Cross Section Small Cross Section Moderate Cross Section Large Cross Section Composite Cross Section Scheduled Rehabilitation Minimum Cross Section Composite Cross Section PORTLAND DISTRICT 13

14 Jetty A Alternatives No Action Scheduled Repairs (Without Engineering Features) Scheduled Rehabilitation Using Small Cross Section * PORTLAND DISTRICT 14

15 North Jetty Proposed Plan Scheduled Rehab PORTLAND DISTRICT 15

16 Environmental Issues North Jetty Lagoon and Wetland Fill Loss of 1.8 acres of wetlands and 4.70 acres of waters of the US. Locating and developing mitigation site. Redirecting stream away from lagoon wetlands. Replacing Jetty Road culvert. PORTLAND DISTRICT 16

17 South Jetty Proposed Plan Scheduled Repair PORTLAND DISTRICT 17

18 Jetty A Proposed Plan Scheduled Rehab PORTLAND DISTRICT 18

19 Spur Groins North Jetty South Jetty Jetty A Channel Side Ocean Side PORTLAND DISTRICT 19

20 Barge-Off loading PORTLAND DISTRICT 20

21 Environmental Issues Dune Augmentation/Stabilization Impacts to dune and shoreline habitat South Jetty Root & Trestle Bay PORTLAND DISTRICT 21

22 PORTLAND DISTRICT 22

23 Technical Overview Rod Moritz PORTLAND DISTRICT 23

24 Proposed Construction Timing North Jetty South Jetty Jetty A Tons Construction Year PORTLAND DISTRICT 24

25 Risks and Path Forward NEPA public review Model approval Public Meeting, Astoria, February 3, Maritime Museum, 5:30 Comment period ends, February 12, 2010 PORTLAND DISTRICT 25

26 PORTLAND DISTRICT 26