AB 691 - Proactively Planning for Sea-Level Rise Impacts

Trustees of granted lands with average annual gross public trust revenues exceeding $250,000, including many ports and harbor districts, are required to develop and submit a sea-level rise adaptation strategy assessment to the Commission by July 1, 2019. The following criteria, resources, and tools are meant to assist granted lands partners with AB 691 compliance. Commission staff are available to assist grantees throughout this process.

Estimating financial costs of sea-level rise

Considering the financial costs associated with the impacts of sea-level rise will help facilitate successful adaptation planning. Estimates may include costs to replace or repair existing facilities and quantifying potential recreation and ecosystem losses. Costs may be projected across the same time scales as sea-level rise, e.g., 2030, 2050 and 2100. The cost of adaptation and mitigation strategies should be estimated, and the potential economic benefits of these strategies. The following resources and tools are available to assist you:

Protecting Public Trust resources impacted by sea-level rise

Please describe in your assessment how proposed sea-level rise adaptation and mitigation strategies will address the coastal asset vulnerabilities identified in your assessment and the implementation timeframe. Please also include whether you plan to monitor the impacts of sea-level rise and the projected effectiveness of implemented adaptation and mitigation strategies.

Sea Level Rise Signs  by Flickr user Julie G https://www.flickr.com/photos/go_greener_oz/3046225225

Assessing sea-level rise impacts

To assess sea-level rise impacts to granted lands, first inventory vulnerable natural and built resources and facilities. Then, consider the impacts of sea-level rise itself and other dynamic coastal processes and climatic events that are projected to be exacerbated by sea-level rise such as coastal erosion, storms, and high tides on the vulnerable assets identified. The following resources and tools are available for assistance:

Developing local maps of future
sea-level rise conditions

There are many free, public, online sea-level rise viewing tools that can be used to create maps of sea-level rise conditions for 2030, 2050, and 2100. FEMA flood hazard maps will also be accepted, if projected time frames match the above years or are appropriately similar. The following resources and tools are available for assistance:


Public Land Management Specialist
Reid Boggiano (916) 574-0450