Hazard Mitigation Plan Update SHELTON, CT

Naugatuck Valley Council of Governments Hazard Mitigation Plan Update 2021 – 2026 Municipal Annex for SHELTON, CT 54 Hill Street Shelton, CT 06484 MMI #3211-29 Prepared for: Prepared by: NAUGATUCK VALLEY COUNCIL OF GOVERNMENTS SLR CONSULTING 47 Leavenworth Street, 3rd Floor 99 Realty Drive Waterbury, CT 06702 Cheshire, Connecticut 06410 (203) 489-0362 (203) 271-1773 www.nvcogct.org www.slrconsulting.com TABLE OF CONTENTS 1.0 INTRODUCTION ......................................................................................................................................... 1-1 1.1 PURPOSE OF ANNEX .................................................................................................................................... 1-1 1.2 PLANNING PROCESS .................................................................................................................................... 1-1 1.3 PHYSICAL SETTING ...................................................................................................................................... 1-1 1.4 LAND COVER ............................................................................................................................................. 1-2 1.5 GEOLOGY .................................................................................................................................................. 1-2 1.6 DRAINAGE BASINS AND HYDROLOGY ............................................................................................................... 1-3 1.7 CLIMATE AND CLIMATE CHANGE .................................................................................................................... 1-4 1.8 DEVELOPMENT TRENDS ................................................................................................................................ 1-5 1.9 HISTORIC AND CULTURAL RESOURCES .............................................................................................................. 1-6 1.10 SOCIAL VULNERABILITY INDEX ........................................................................................................................ 1-7 2.0 MUNICIPAL CAPABILITIES .......................................................................................................................... 2-8 2.1 GOVERNMENTAL STRUCTURE AND CAPABILITIES................................................................................................. 2-8 2.2 INFRASTRUCTURE ...................................................................................................................................... 2-13 2.3 CRITICAL FACILITIES AND EMERGENCY RESPONSE.............................................................................................. 2-13 3.0 FLOODING ............................................................................................................................................... 3-17 3.1 EXISTING CAPABILITIES ............................................................................................................................... 3-17 3.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 3-18 4.0 HURRICANES AND TROPICAL STORMS .................................................................................................... 4-24 4.1 EXISTING CAPABILITIES ............................................................................................................................... 4-24 4.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 4-25 5.0 SUMMER STORMS AND TORNADOES ..................................................................................................... 5-27 5.1 EXISTING CAPABILITIES ............................................................................................................................... 5-27 5.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 5-27 6.0 WINTER STORMS ..................................................................................................................................... 6-29 6.1 EXISTING CAPABILITIES ............................................................................................................................... 6-29 6.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 6-29 7.0 GEOLOGICAL HAZARDS ........................................................................................................................... 7-31 7.1 EXISTING CAPABILITIES ............................................................................................................................... 7-31 7.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 7-31 8.0 DAM FAILURE .......................................................................................................................................... 8-33 8.1 EXISTING CAPABILITIES ............................................................................................................................... 8-33 8.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 8-33 9.0 WILDFIRES ............................................................................................................................................... 9-37 9.1 EXISTING CAPABILITIES ............................................................................................................................... 9-37 9.2 VULNERABILITIES AND RISK ASSESSMENT ........................................................................................................ 9-37 10.0 MITIGATION STRATEGIES AND ACTIONS ............................................................................................... 10-40 10.1 GOALS AND OBJECTIVES ........................................................................................................................... 10-40 10.2 STATUS OF MITIGATION STRATEGIES AND ACTIONS FROM PREVIOUS HMP .......................................................... 10-40 10.3 PRIORITIZATION OF STRATEGIES AND ACTIONS ............................................................................................... 10-47 10.4 MITIGATION STRATEGIES AND ACTIONS IMPLEMENTATION TABLE ...................................................................... 10-47 Municipal Annexes: Shelton 1.0 INTRODUCTION 1.1 Purpose of Annex This Hazard Mitigation Plan (HMP) annex provides a community-specific hazard risk assessment, capability analysis, and evaluation and prioritization of hazard mitigation measures and projects. Background information and the regional effects of pertinent natural hazards are discussed in the main body of the Naugatuck Valley Council of Governments (NVCOG) Multi-Jurisdictional Hazard Mitigation Plan. This annex is designed to supplement the information presented in the Multi-Jurisdictional HMP with more specific local detail, and is not to be considered a standalone document. The primary goal of this HMP, including this Municipal Annex, is to identify natural hazard risks and mitigation opportunities in order to reduce the loss of or damage to life, property, infrastructure, and natural, cultural, and economic resources. This includes the reduction of public and private damage costs. Limiting losses of and damage to life and property will also reduce the social, emotional, and economic disruption associated with a natural disaster. 1.2 Planning Process A meeting was held with Shelton representatives on November 05, 2020 for the purposes of initial data collection and review of necessary updates for this document. The meeting was convened by the HMP local coordinator, Michael Maglione. Additional input was provided at the two regional municipal staff workshops, held on November 18, 2020, and February 3, 2021. Public input collected at public workshops and through an online survey have also informed development of this HMP update. 1.3 Physical Setting Shelton was first settled by the English in 1639 as part of the town of Stratford and subsequently split from Stratford in 1789. The City of Shelton is often associated with its fellow communities of Fairfield County given the suburban nature of much of the city. Nevertheless, the downtown area of Shelton has much in common with the Lower Naugatuck Valley communities. In general, the topography of the region increases in elevation moving from the shorelines of the major rivers (the Housatonic and Naugatuck Rivers, which are nearly at sea level) to the east and/or west of either river. Within the region, elevations of 500 feet or greater are found along western and southwestern Seymour and western Shelton while there are a few other smaller, more concentrated areas of this elevation in northern and eastern Seymour and northeastern Ansonia. NVCOG Hazard Mitigation Plan Update 1-1 August 2021 Municipal Annexes: Shelton 1.4 Land Cover A high-density industrial center developed in the 19th and 20th centuries in downtown Shelton, and remains one of the highest-density parts of the City. A decrease in developed land cover is evident with greater distance from either river. The majority of the rural and farmland cover is found in northwest Shelton.

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