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 -0.147 -0.48 Mean High Water
DTL -0.49 -1.61 Mean Diurnal Tide Level
MTL -0.528 -1.73 Mean Tide Level
MSL -0.529 -1.74 Mean Sea Level
MLW -0.909 -2.98 Mean Low Water
MLLW -0.979 -3.21 Mean Lower-Low Water
NAVD88 -2.824 -9.27 North American Vertical Datum
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