15 C.F.R. § 930.151
The term "interstate coastal effect" means any reasonably foreseeable effect resulting from a federal action occurring in one State of the United States on any coastal use or resource of another State that has a federally approved management program. Effects are not just environmental effects, but include effects on coastal uses. Effects include both direct effects which result from the activity and occur at the same time and place as the activity, and indirect (cumulative and secondary) effects which result from the activity and are later in time or farther removed in distance, but are still reasonably foreseeable. Indirect effects are effects resulting from the incremental impact of the federal action when added to other past, present, and reasonably foreseeable actions, regardless of what person(s) undertake(s) such actions. The term "affects" means have an effect on. Effects on any coastal use or resource may also be referred to as "coastal effects."
15 C.F.R. § 930.151