Restoring the lower pawtuxet river
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Restoring the Lower Pawtuxet River. Public Meeting January 29, 2008. Meeting Agenda. 7:10-7:15 Welcome (Bob Nero, Chairman, PRA) 7:15-7:25 River Restoration in R.I. (Dir. Mike Sullivan, DEM) 7:25-7:45 Project Overview (Tom Ardito, NBEP)

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Restoring the Lower Pawtuxet River

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Restoring the lower pawtuxet river

Restoring the LowerPawtuxet River

Public MeetingJanuary 29, 2008


Restoring the lower pawtuxet river

Meeting Agenda

7:10-7:15 Welcome (Bob Nero, Chairman, PRA)

7:15-7:25 River Restoration in R.I. (Dir. Mike Sullivan, DEM)

7:25-7:45 Project Overview (Tom Ardito, NBEP)

7:45-8:15 Restoration Alternatives & Recommendations

(Jim MacBroom, MMI)

8:15-8:45 Open Discussion

8:45-9:00 Funding & Next steps (Ardito)


Restoring the lower pawtuxet river

The Pawtuxet River Authority was created by an act of the RI Legislature in 1972.

TITLE 46Waters and Navigation

CHAPTER 46-24Pawtuxet River Authority

SECTION 46-24-2

   § 46-24-2  Pawtuxet River authority created. – A board to be known as the Pawtuxet River authority is hereby created. The board shall be a body corporate and politic, constituting a public benefit corporation, and shall serve as the governing body of the authority for the purposes of this chapter. The powers of the corporation shall be vested in and exercised by the majority of the members of the board hereby created and in office.


Current projects

Current Projects

1. Fish passage

at Pawtuxet Falls

2. Canoe launch and nature area at Pocasset

3. Pontiac canoe launch and 48 acre wildlife area

4. Riverwalk at Royal Mills

5. Veterans Square fishing and canoe access

6. Riverwalk & Harris Dam fishing area

1

2

3

6

4

5


Project overview

Project Overview

  • Introductions

  • Purpose of the project

  • Fish biology/watershed ecology

  • Project process


Restoring the lower pawtuxet river

Project Partners

  • Pawtuxet River Authority and Watershed Council

  • Narragansett Bay Estuary Program

  • Save The Bay, Inc.

  • R.I. Coastal Resources Management Council

  • R.I. Corporate Wetlands Partnership

  • R.I. Department of Environmental Management

  • U.S.D.A. Natural Resources Conservation Service

  • National Oceanic and Atmospheric Administration

  • U.S. Environmental Protection Agency

  • U.S. Fish and Wildlife Service

  • And, we hope, YOU!!! People who care about the environment of the Pawtuxet River & the community of Pawtuxet Village


Restoring the lower pawtuxet river

Why Restore the Lower Pawtuxet?

Goal:

  • To restore historic runs of migratory fish (particularly river herring and shad) to the lower Pawtuxet River

    Purpose:

  • To improve the environment of the Pawtuxet River, Narragansett Bay, and historic Pawtuxet Village

    Benefits:

  • Increase Fish & Wildlife in Pawtuxet River and Narragansett Bay

  • Improve Rhode Island’s Fresh and Salt Water Fisheries

  • Restore Historic Ecological Connection between Bay and Watershed

  • Restore Historic Natural and Cultural Feature of Pawtuxet Village


Restoring the lower pawtuxet river

R.I. Inland Fisheries Commission, 1869:

“This generation has seen our streams filled with shad and herring…..The principle rivers in the State which were formerly the home of the salmon, shad and herring, are the Blackstone, Pawtuxet and Pawcatuck, and these have become so obstructed with dams, that they no longer offer a passage to their upper waters, which nature prompts the fish to seek at spawning time.”


Restoring the lower pawtuxet river

“Target Species”

River Herring or “Buckies”

Alewife(Alosa pseudoharengus)

Blueback Herring(Alosa aestivalis)

American shad(Alosa sapidissima)


Restoring the lower pawtuxet river

Historic Pawtuxet Falls

Fishing for Buckies, About 1910

Early 1900’s


Restoring the lower pawtuxet river

1800’s

Many changes over time


Pawtuxet falls today

CONCRETE

Pawtuxet Falls Today

BEDROCK

CONCRETE


Restoring the lower pawtuxet river

Restoration Process (What We’re Doing)

  • Feasibility Study: Completed 2005

  • Hydrologic Modeling & Alternatives Analysis: Completed 2007/08. Considerations included:

    • Fish passage for target species

    • Visual Impacts (Aesthetic Considerations)

    • Other Environmental Impacts (Habitat, Wetlands, Water Quality)

    • Recreation (canoeing, kayaking, fishing)

    • Sediment (movement, exposure, erosion, siltation)

    • Flooding

    • Maintenance

    • Cost of Alternatives

  • Next steps:

    • Finalize alternative

    • Begin permitting

    • Funding & Construction (2009, pending $$)


Restoring the lower pawtuxet river

Scope of Work

  • Sediment Sampling and Analysis

  • Bathymetric Survey

  • Hydraulic Modeling

  • Alternatives Evaluation

    • Fish Passage

    • Ecological implications

    • Sediment Stability

    • Recreation

    • Morphology / Hydraulics


Fish passage barriers

Dams

Culverts

Bridges

Tide Gates

Utility Crossings

High Velocity

Shallow Water

Poor Substrate

Water Temperature

Low Oxygen

Fish Passage Barriers


Restoring the lower pawtuxet river

Restoration Alternatives

  • No Action—Leave River As-Is

  • Full Dam Removal

  • Partial Dam Removal

  • Full Removal with construction of New Rock Ramp Upstream

  • Denil Fish Ladder


Restoring the lower pawtuxet river

STUDY PROCESS

DAM MANAGEMENT ALTERNATIVES

DATA COLLECTION

DAM SAFETY

BASE DATA

HAZARD CLASSIFICATION

NID

PHYSICAL INSPECTION

FEMA

SPILLWAY CAPACITY

STATE AGENCIES

SITE DATA

SIZE CLASSIFICATION

DESIGN PLANS

TOPOGRAPHY

OPERATIONAL HAZARDS

HISTORY

WETLANDS

STRUCTURAL /

GEOTECH

.

OWNERSHIP

RARE SPECIES

AS

-

BUILT DATA

HYDROLOGY

USE

GEOLOGY

NO

YES

IS DAM

HISTORIC VALUE

EMERGENCY

SAFE?

REPAIRS OR

SEDIMENTS

PUBLIC &

DRAWDOWN

WATER QUALITY

REGULATORY

PARTICIPATION

REPAIR OR

MARGINAL

REPLACE DAM

DAM

IDENTIFY

ALTERNATIVES

RETAIN DAM AND IMPOUNDMENT

ELIMINATE DAM AND IMPOUNDMENT

PROVIDE FISH PASSAGE

LOWER

CREST

HIGH LEVEL

NO ACTION

U/S

FISH

D/S

FULL

LOW LEVEL

PARTIAL

BY

-

PASS

RAMP

LADDER

RAMP

REMOVAL

BY

-

PASS

BREACH

CHANNEL

OTHER

LIMITED FEASIBILITY STUDY

VERY SMALL

OR LOW RISK

YES

SITE SPECIFIC TOPICS

DAM, SIMPLE

DECOMMISSION

NO

PUBLIC & REGULATORY

PARTICIPATION, SELECT

DETAILED FEASIBILITY STUDY

ALTERNATIVE

HYDRAULIC ANALYSIS

SEDIMENT TESTING

SEDIMENT TRANSPORT

CHANNEL MORPHOLOGY

U/S AND D/S IMPACTS

WETLAND IMPACTS

IMPLEMENTATION

LAND USE / AESTHETICS

CONSTRUCTION PLANS

AQUATIC SPECIES

SPECIFICATIONS

RECREATION

COST ESTIMATES

For additional information,

LAND RIGHTS

FUNDING

please contact:

WATER RIGHTS

EASEMENTS

James MacBroom, P.E.

UTILITIES

REGULATORY PERMITS

ACCESS

CONSTRUCTION ADMINISTRATION

FINANCIAL IMPACTS

SITE RESTORATION

CONSTRUCTION METHODS

AS

-

BUILTS

716

-

726 South Main Street

SITE RESTORATION

OPERATIONAL PLAN

Cheshire, Connecticut 06410

Telephone (203) 271

-

1773

EROSION CONTROL

EMERGENCY RESPONSE PLAN

Fax (203) 272

-

9733

E

-

Mail:

[email protected]

Study Process

Design Management Alternatives


Restoring the lower pawtuxet river

Engineering Issues

  • Type & Condition of Dam (Safety)

  • Site Limitations (Utilities, Access)

  • Up & Downstream Issues (Bridges/Structures, Tributaries)

  • Environmental Permitting

  • Alternatives Analysis


Design variables

Design Variables

  • Channel Morphology

  • Channel Gradient

  • Profile Pattern

  • Channel Width & Depth

  • Mannings Roughness Coefficient

  • Materials

  • In-Channel Features

  • Sediment Transport / Stability


Restoring the lower pawtuxet river

Fish Criteria

8

6

TOO DEEP

DEPTH (FEET)

4

TOO FAST

2

TOO SHALLOW

0

6

8

0

4

2

VELOCITY (FPS)


Restoring the lower pawtuxet river

Channel Profile


Restoring the lower pawtuxet river

No Action


Restoring the lower pawtuxet river

Full Removal

Existing Conditions Low Tide

Full Removal Low Tide


Restoring the lower pawtuxet river

Partial Removal

Existing Conditions Low Tide

Partial Removal Low Tide


Summary of water surface elevations controlled breach mean april flow @ low tide

Summary of Water Surface ElevationsControlled Breach Mean April Flow @ Low Tide


Restoring the lower pawtuxet river

Full Removal with Upstream Ramp


Fish ladder design criteria

Fish Ladder Design Criteria

  • Low Velocity

  • Water Depth

  • Fish Entry

  • Fish Exit

  • Upstream Flow Control

  • Variable River Stages

  • Vertical Rise


Restoring the lower pawtuxet river

Fish Ladder

Existing Conditions

Proposed Conditions


Restoring the lower pawtuxet river

Funding & Next Steps

  • Feb. 2008

    • Evaluate Public Comments

    • Meet with Regulators

  • March 2008

    • Finalize Preferred Alternative

    • Another Public Meeting to Present

  • 2008

    • Permitting

    • Design & Engineering

    • Fundraising: Non-Federal Match, approx. $100,000

  • 2009: Construction


Restoring the lower pawtuxet river

THANK YOU!


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