Inundation Analysis Tool


9439201 St Helens, OR

Please see the data inventory to find a period with hourly or six-minute data available.
Data Inventory

Select a reference elevation and specify a date range for analysis.

You may select from an accepted tidal datum or specify a different elevation.
Most elevations on land are given relative to a geodetic datum such as NAVD88

All analysis results are presently provided in meters relative to the requested threshold.

Meters relative to MHHWFeet relative to MHHWDatum
MHHW 0.0 0.0 Mean Higher-High Water
MHW -0.148 -0.49 Mean High Water
DTL -0.493 -1.62 Mean Diurnal Tide Level
MTL -0.532 -1.75 Mean Tide Level
MSL -0.533 -1.75 Mean Sea Level
MLW -0.917 -3.01 Mean Low Water
MLLW -0.985 -3.23 Mean Lower-Low Water
User Specified Elevation         in       relative to   


Note: Data query is limited to a 10 year maximum and 1 month minimum date range when requesting an analysis of 6-minute data


6-minute Height and High Water Analysis
Hourly Height and High Water Analysis
Hourly Height Analysis