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For every TxDOT project, environmental practitioners must assess the potential indirect and cumulative impacts to comply with the environmental project delivery process outlined in the National Environmental Policy Act (NEPA). The resources below include a collection of guidance from national transportation organizations and tools to assist with indirect and cumulative impact assessments for TxDOT projects.

Questions? Contact the Environmental Affairs Division's indirect and cumulative impacts specialist at (512) 416-2698.

Title Date Description Format
Environmental Handbook for Indirect and Cumulative Impacts 03/14 Outlines the TxDOT process for conducting and documenting a thorough and defensible analysis of indirect induced growth and/or cumulative impacts for a transportation project
TxDOT's Guidance on Preparing Indirect and Cumulative Impact Analyses 09/10 Provides guidance on how TxDOT conducts indirect and cumulative analysis. However, TxDOT has since updated its guidance for cumulative analysis. Use this document for conducting indirect analysis only
Finding Census Data 04/13 A tutorial on how to obtain demographic data from the American Community Survey website, with screen shots highlighting tabs and menus
AASHTO Practitioner's Handbook 12: Assessing Indirect Effects and Cumulative Impacts Under the National Environmental Policy Act (NEPA)   Provides American Association of State Highway and Transportation Officials (AASHTO) guidance for assessing indirect effects and cumulative impacts for transportatoin projects. This also describes approaches for using the statewide and metropolitan transportation planning process
Questions and Answers Regarding the Consideration of  Indirect and Cumulative Impacts in the NEPA Process   Provides Federal Highway Administration's (FHWA) guidance by responding to frequently asked questions about indirect and cumulative impacts analyses
SHRP2 Capacity Research: Interactions Between Transportation Capacity, Economic Systems and Land Use   Provides the results of the Capacity Project conducted by the second Strategic Highway Research Program (SHRP2) and designed to create a large database of case studies and a web-based tool, both allowing a faster assessment of the long-term economic impacts of highway capacity projects
T-PICS: Transportation Project Impact Case Studies   Provides case studies, including project details, impacts, and factors affecting those impacts; allows searches for relevant case studies by using the type of project and setting; and allows searches for a range of likely impacts based on the studies by using the specific type of proposed project
Texas State Data Center   Provides data on population estimates for places and counties that submitted age, sex and race and/or ethnicity details
Eight Keys to Legally Sufficient ICI Analysis
  Assists practitioners to produce a legally sufficient indirect and cumulative (ICI) impact analyses

Indirect Effects Guidance

Title Date Description Format
Induced Growth Indirect Impacts Decision Tree 04/14 Helps analysts determine if an induced growth analysis is necessary by showing the TxDOT process with all potential outcomes and places where decisions dictate which outcome is appropriate
Risk Assessment for Indirect Impacts
04/14 Completed to document and record the need or lack of need of an indirect impact analysis
Forecasting Indirect Land Use Effects of Transportation Projects   Provides the results of a study on methods for estimating changes to land use and is helpful for projects classified as environmental impact statements
Desk Reference for Estimating the Indirect Effects of Proposed Transportation Projects (NCHRP Report 466)
  Contains detailed instruction for completing an indirect impacts analysis and explains complex that are helpful for projects classified as environmental impact statements

Cumulative Impacts Guidance

Title Date Description Format
Cumulative Impacts Analysis Guidelines 03/14 Provides TxDOT guidance focused on the assessment of cumulative impacts of transportation projects on the natural and human environment
Risk Assessment for Cumulative Impacts Analysis Guidelines 04/14 Completed to document and record the need or lack of need for an analysis
Cumulative Impacts Decision Tree 04/14 Helps analysts determine if a cumulative impacts analysis is necessary by showing the TxDOT process with all potential outcomes and places where decisions dictate which outcome is appropriate
Consideration of Cumulative Impacts in EPA Review of NEPA Documents   Provides insight into the U.S. Environmental Protection Agency perspective for reviewing cumulative effects analyses
Guidance on the Consideration of Past Actions in Cumulative Effects Analysis   Provides guidance from the Council on Environmental Quality on the extent to which agencies of the federal government are required to analyze the environmental effects when describing the cumulative environmental effect of a proposed transportation action

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