Arboretum Bridge and Trail Design Concept Design Meeting | 5.21.2019 - PowerPoint PPT Presentation

Arboretum Bridge and Trail Design Concept Design Meeting | 5.21.2019 & 5.22.2019 Presenters: Michael Commisso, National Park Service Kyle Ohlson, District Department of Transportation Joseph Spadea, Pennoni

Agenda • Meeting Purpose: A New Pedestrian Bridge and Trail • Project History & Location • Site Context / Design Constraints • Recommended Bridge Elevation • Additional Considerations • Open House 2

Meeting Purpose • Arboretum Bridge & Trail • Anacostia Waterfront Initiative 3

Project History • EA / FONSI – 2011 / 2012 • NPS in collaboration with DDOT to realign Section 3 of ART 4

Project Benefits • Provide a safe and more natural Anacostia River experience • Feature connection between east and west trail network • Bridge as place for both trail and river users • Extension of US National Arboretum / NPS educational opportunities and programs 5

Project Location Project Location 6 6

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Concept Design 9 9

Concept Design CROSS-SECTION 10 10

Concept Design Ear EarlyConce cepts from EA/FONSI 11

Concept Design 12 12

Site Context 4  Photo 1. Looking towards US  Photo 2. Looking towards future East National Arboretum, West Ba Bank of the Abutment towards Kenilworth Park Anacostia Ri River 3 1 2  Photo 3. View looking North from  Photo 4. Adjacent Kenilworth Park Kenilworth Park, East Side Trail segm gment, East Side 13 13

Site Context 8 7  Photo 5. View from Ar Arboretum  Photo 6. View from Kenilworth Park side looking towards Kenilworth Park 5 6  Photo 7. View of existing trail  Photo 8. View of existing trail connection connection 14 14

Site Context 10  Photo 9. View of turf and fields looking north 11 9  Photo 10. View of existing seawall,  Photo 11. View of mature trees looking north with Kudzu 15 15

Site Context 14 15  Photo 12. View towards arboretum  Photo 13. View from west shore looking fence west 13 12  Photo 15. View from west shore  Photo 14. View from west shore Looking g northeast Looking southeast 16 16

Site Context  Anacostia Ri River Trail over CS CSX  Anacostia Ri  Kenilworth Trail by Aquatic Gardens River Trail over CS CSX   Anacostia Ri River Trail over CS CSX  Kenilworth Trail Pedestrian Br Bridge near Dean an Ave.  Anacostia Ri River Trail along Section E of Anacostia Park 17 17

Design Constraints Ear EarlyConce cepts from EA/FONSI 18

Design Constraints Kenilworth Park Landfill Limits • Kenilworth Landfill • Two Seawalls • Freeboard Helps define • MHW EL. 2.04 minimum bridge • 100 yr EL. 15.00 height/under- • DEM: 2 ft. above 100 yr Anacostia River clearance East Seawall • Construction Footprint & Cost • Future Maintenance • Aesthetics 19

Design Constraints Hammer-head ier  Pie  Pie ier g geometry v varie ies dramatic icall lly b based o on d dual l gir irder a and t truss superstructure t types. ier  Fla lared P Pie  EA/ A/FONSI Concepts (2011-2012) 2012) ier  Tapered P Pie  Early Design Concepts (2016-2017) 2017)  Early Pier Concepts (2016-2017) 2017) 20 20

Design Constraints 21 21

Design Constraints  Railing alternatives  Railing lighting alternatives  Rock Cr Creek Park Ra Railing  Georgetown Waterfront Park Ra Railing 22 22

Design Constraints • Proposed USCG Channel • 80’ Wide x 16’ High • 20’ buffers • 120’ Span 23

Design Constraints • Proposed USCG Channel • 80’ Wide x 16’ High • 20’ buffers • 120’ Span 24

Design Constraints • Proposed USCG Channel • 80’ Wide x 16’ High • 20’ buffers • 120’ Span 25

Additional Considerations River User Safety ty: At 225’ wide, (low tide) this stretch of the Upper Anacostia allows ws fo for 5 lanes – two wo upstream, two wo downstream, one fo for traff ffic c separation / stationary instruct ction. Lanes are 45’ wide each 26 26

Original Span Configuration • Span arrangement same as EA/FONSI Conce cept • Verti tical clearance per DEM 90’ 45’ 90’ x 2 x 2 x 1 x 1 x 2 x 2 27 27

Alternative Span Configuration • Shifted East (18’ - 6”) 90’ 45’ 90’ x 2 x 2 x 1 x 1 x 2 x 2 28 28

New Span Configuration • Shifted Ea East t – with Spans 2 and 3 lengthened to 132’ - 6” • Pier 3 Integral with th Seawall 90’ 45’ 90’ x 2 x 2 x 1 x 1 x 2 x 2 29 29

Original Span Confi figuration 30 30

New w Span Configuration 31 31

US NATIONAL ARBORETUM KENILWORTH PARK 32 32

US NATIONAL KENILWORTH ARBORETUM PARK 33 33

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Next Steps • 30 Day ay Input Peri riod • Contin inued Publi lic Outre reac ach & Agency Coordin inatio ion • Geotechnic ical al testin ing • 65% Design ign • Foll llow-up Public lic Meetin ing • 90% Design ign • Submis issio ion of Plan ans, Specif ific icatio ions & Estim imates 36 36

Thank You Contact Us: Stacee Hemby Public Outreach Coordinator stacee@tbaconnects.com www.anacostiawaterfont.org 37 37

Site Visit Video 38