Coastal erosion rates vary sharply by coastline, measurement period, and local landform. In the USGS long-term California dataset covering the 1800s to the 2010s, average shoreline change ranged from -0.16 m/yr in Central California to 0.30 m/yr in Southern California; negative values indicate erosion or landward movement, while positive values indicate accretion or seaward movement. The figures below keep those signs, uncertainties, geographies, and periods explicit.
Contents
- California’s long-term regional averages
- How widespread erosion is in California
- Florida and Georgia shoreline-change rates
- Puerto Rico: short-term and long-term comparisons
- Texas and Great Lakes benchmarks
- England’s coastal-erosion risk projections
- Australia’s national shoreline monitoring
California’s long-term regional averages
The USGS summary statistics for California describe shoreline change from the 1800s to the 2010s. The dataset includes 5,793 Northern California transects, 6,584 Central California transects, and 6,686 Southern California transects. A transect is a measurement line used to compare shoreline positions through time.
| California region | Average shoreline change | Average-rate uncertainty | Long-term transects |
|---|---|---|---|
| Northern California | 0.02 m/yr | 0.05 m/yr | 5,793 |
| Central California | -0.16 m/yr | 0.04 m/yr | 6,584 |
| Southern California | 0.30 m/yr | 0.03 m/yr | 6,686 |
Central California is the only one of the three regions with a negative long-term average in these statistics. Its rate was -0.16 +/- 0.04 m/yr. Northern California’s average was close to stable at 0.02 m/yr, with an uncertainty of 0.05 m/yr. Southern California recorded a positive average of 0.30 +/- 0.03 m/yr.
These regional averages do not mean every beach behaved the same way. They summarize many transects across broad coastlines, and the uncertainty attached to each average is part of the measurement context. The period also spans historical shoreline observations from the 1800s through the 2010s, rather than representing a single recent year.
How widespread erosion is in California
The same USGS report separates the share of transects that experienced erosion from the regional average rate. Erosion occurred at 55% of Northern California long-term transects, 66% of Central California transects, and 41% of Southern California transects. Statistically significant erosion occurred at 21%, 33%, and 17%, respectively.
The difference between “erosion occurred” and “statistically significant erosion” matters. The first measure describes the direction recorded at transects; the second identifies a narrower subset meeting the report’s statistical significance criterion. They should not be treated as interchangeable estimates of the same quantity.
Local extremes were much larger than the regional averages. Maximum long-term erosion reached -2.5 +/- 3.8 m/yr south of the Eel River in Northern California, -3.2 +/- 2.6 m/yr at Point Ano Nuevo in Central California, and -1.5 +/- 0.5 m/yr at Point Mugu State Park in Southern California. The same report recorded maximum long-term accretion of 3.5 +/- 1.3 m/yr at Morro Rock Beach in Central California.
Those locations show why a statewide or regional mean cannot describe every shoreline segment. Erosion and accretion can coexist within the same broad region, while individual sites may have rates several times larger in magnitude than the regional average.
Florida and Georgia shoreline-change rates
The USGS summary for the Georgia and Florida coasts covers updated vector shorelines from the 1800s to the 2010s. Its long-term average rates differ among Georgia, the two Florida coasts, and the Florida panhandle.
Georgia’s long-term average shoreline-change rate was 0.70 +/- 0.19 m/yr. Florida’s east coast averaged 0.20 +/- 0.03 m/yr, and its west coast averaged 0.30 +/- 0.05 m/yr. The Florida panhandle had a negative average of -0.20 +/- 0.07 m/yr.
The share of long-term transects where erosion occurred was 39% in Georgia, 42% on Florida’s east coast, 45% on its west coast, and 61% in the panhandle. The panhandle therefore combined the most negative regional average in this comparison with the highest erosion share.
Among erosional transects, the average rates were more negative than the all-transect regional averages. Georgia’s erosional transects averaged -1.80 +/- 0.09 m/yr. The corresponding averages were -0.40 +/- 0.02 m/yr on Florida’s east coast, -0.70 +/- 0.03 m/yr on the west coast, and -0.90 +/- 0.03 m/yr in the panhandle.
This distinction is useful for interpreting coastal conservation data: an all-transect average includes both erosion and accretion, while an average among erosional transects describes the pace within the subset moving landward.
Puerto Rico: short-term and long-term comparisons
The USGS Puerto Rico shoreline-change report provides both short-term statistics, approximately from the 1970s to 2018, and long-term statistics from the early 1900s to 2018. The periods differ, so their rates should be compared as separate measurement windows.
On Puerto Rico’s North coast, the short-term average shoreline-change rate was 0.46 +/- 0.15 m/yr, compared with 0.04 +/- 0.03 m/yr for the long-term period. Erosion affected 30.30% of short-term North transects and 45.30% of long-term North transects.
Within the North coast’s erosional transects, the short-term mean erosion rate was -0.31 +/- 0.02 m/yr and the long-term mean was -0.25 +/- 0.01 m/yr. Within accreting transects, the short-term mean accretion rate was 0.81 +/- 0.04 m/yr, while the long-term mean was 0.29 +/- 0.01 m/yr.
Puerto Rico’s East coast had a short-term average shoreline-change rate of 0.31 +/- 0.11 m/yr and a long-term average of 0.06 +/- 0.04 m/yr. These figures illustrate how the selected period can affect the reported average: a shorter window and a century-scale window can show different balances of erosion and accretion.
Texas and Great Lakes benchmarks
The Texas General Land Office coastal-erosion benchmark reports an average erosion rate of 4.1 feet per year along Texas’s 367-mile coast. This is a published benchmark accessed in 2026; it is expressed in feet per year and should not be silently treated as the same measurement series as the USGS meter-per-year transect summaries.
The USGS California report also cites historical Great Lakes benchmarks. The cumulative average annual shoreline-change rate for the Great Lakes is given as 0.10–0.29 m/yr. Long stretches of Lake Erie shoreline have erosion rates greater than 2 m/yr, while many eroding Great Lakes bluffs have average recession rates from 0.5 to more than 1 m/yr.
For eastern Lake Erie in Pennsylvania, the cited bluff-erosion rate was -0.2 +/- 0.1 m/yr over 1938–1998. The associated bluff retreat was 12 m across that 60-year analysis interval. These Great Lakes figures concern shoreline or bluff recession, so the local landform and measurement definition are important when comparing them with sandy-coast rates.
England’s coastal-erosion risk projections
The National assessment of flood and coastal erosion risk in England 2024 analyzes coastal erosion at approximately 8,000 locations. It reports local erosion rates on England’s east coast reaching up to 4 m/yr in its 2024 assessment.
The assessment also gives property counts under different planning horizons and assumptions. With plans delivered, about 3,500 properties were identified as at coastal-erosion risk through 2055, and about 10,100 properties through 2105. Without plan actions, the number at risk through 2055 could reach 32,800 in the stated worst-case scenario.
Under climate change with plans delivered, the assessment projects 19,700 properties at coastal-erosion risk by 2105. These are projections or risk scenarios, not measured shoreline rates. They should therefore be read alongside, rather than substituted for, the observed rates from California, Florida, Georgia, Puerto Rico, Texas, or the Great Lakes.
Australia’s national shoreline monitoring
Australia’s DEA Coastlines maps annual shoreline change since 1988 at 30-metre spacing along the entire Australian coastline. The product description reports nearly 58,000 independent measurements.
The monitoring record also shows that change is not uniformly erosional. One product example, Twilight Cove in Western Australia, has grown by more than 500 m since 1988. That example is accretion or seaward growth, not a coastal-erosion rate, and it reinforces the need to preserve the sign and direction of shoreline change when using national monitoring products.