Seaside, OR Coastal Erosion Rate
Is the coast eroding 1.4 miles north of Seaside, OR?
Unusual good news for this stretch: the shoreline 1.4 miles north of Seaside, OR has grown by a measured 1.99 feet a year on average, per USGS's long-term transect data for this section. At that rate, the shoreline has gained roughly 19.9 feet over the last decade.
What "Seaside" means on this page
USGS surveys the coast in transects spaced a few hundred feet apart; this page groups the nearest ones into a single ~3.5-mile reading for the stretch closest to Seaside, OR, rather than showing one arbitrary line. Segment center: 46.01, -123.92. USGS's Pacific Northwest assessment last surveyed this stretch through 2002-2011, computing the rate with its LRR method. Other US regions were surveyed in different years, sometimes decades apart, so this page states its own rather than implying one national vintage.
What 1.99 ft/yr means over time
Holding the 1.99 ft/yr accretion rate 1.4 miles north of Seaside, OR for 25 years would add roughly 50 feet of shoreline, again assuming nothing about the local sediment supply changes.
Where this fits nationally
Averaging 49 separate transects produced this segment's rate, with 0% individually reading as erosion, rather than relying on any single survey line. USGS's confidence interval here is ±1.3 ft/yr. Sorted from fastest erosion to fastest growth across all 1211 measured segments nationally, this one lands at 1155. Source: USGS Open-File Report 2012-1008. Newport Beach, CA sits at national rank 1098 for growth (0.94 ft/yr), one reference point among the 1211 scored segments, 914 miles from here. Gearhart, OR, 1.7 miles off, is the adjacent measured stretch, reading accretion (beach growing) at 2.24 ft/yr.
Not this whole stretch, just Seaside itself: the Coastal Change Hazards Portal is USGS's own live version of this data.