diff --git a/src/main/java/org/opendcs/usgs/waterdata/MonitoringLocation.java b/src/main/java/org/opendcs/usgs/waterdata/MonitoringLocation.java
index b72a7a7..134facc 100644
--- a/src/main/java/org/opendcs/usgs/waterdata/MonitoringLocation.java
+++ b/src/main/java/org/opendcs/usgs/waterdata/MonitoringLocation.java
@@ -30,10 +30,15 @@ static MonitoringLocation findByNumber(List<MonitoringLocation> locations, Strin
     public String siteType;
     public String hydrologicUnitCode;
     public String basinCode;
+    /**
+     * Altitude of the gage or land surface, which is not the gage datum, so stage
+     * (Parameter.STAGE) cannot be converted to water-surface elevation by adding it.
+     */
     public String altitude;
     public String altitudeAccuracy;
     public String altitudeMethodCode;
     public String altitudeMethodName;
+    /** The vertical datum that altitude is referenced to, such as NAVD88. */
     public String verticalDatum;
     public String verticalDatumName;
     public String horizontalPositionalAccuracyCode;
diff --git a/src/main/java/org/opendcs/usgs/waterdata/Parameter.java b/src/main/java/org/opendcs/usgs/waterdata/Parameter.java
index 3527dab..746a2b8 100644
--- a/src/main/java/org/opendcs/usgs/waterdata/Parameter.java
+++ b/src/main/java/org/opendcs/usgs/waterdata/Parameter.java
@@ -11,19 +11,27 @@ public final class Parameter {
     public static final String RELATIVE_HUMIDITY = "00052";
     public static final String RESERVOIR_STORAGE_AC_FT = "00054";
     public static final String DISCHARGE = "00060";
+    /** Reservoir water-surface elevation above the local gage datum, which MonitoringLocation.altitude cannot supply. */
+    public static final String ELEVATION_RESERVOIR_ABOVE_DATUM = "00062";
     public static final String STAGE = "00065";
     public static final String SPECIFIC_CONDUCTANCE = "00095";
     public static final String SALINITY = "00096";
     public static final String RESERVOIR_STORAGE = "72036";
     public static final String SOLAR_RADIATION = "62608";
+    /** Lake or reservoir water-surface elevation above NGVD 1929. */
+    public static final String ELEVATION_LAKE_NGVD29 = "62614";
+    /** Lake or reservoir water-surface elevation above NAVD 1988. */
+    public static final String ELEVATION_LAKE_NAVD88 = "62615";
+    /** Stream water-surface elevation above NAVD 1988. */
     public static final String ELEVATION_NAVD88 = "63160";
 
     public static List<String> all() {
         return List.of(
                 WATER_TEMPERATURE, AIR_TEMPERATURE, WIND_SPEED, WIND_DIRECTION,
                 PRECIPITATION, RELATIVE_HUMIDITY, RESERVOIR_STORAGE_AC_FT,
-                DISCHARGE, STAGE, SPECIFIC_CONDUCTANCE, SALINITY,
-                RESERVOIR_STORAGE, SOLAR_RADIATION, ELEVATION_NAVD88);
+                DISCHARGE, ELEVATION_RESERVOIR_ABOVE_DATUM, STAGE,
+                SPECIFIC_CONDUCTANCE, SALINITY, RESERVOIR_STORAGE, SOLAR_RADIATION,
+                ELEVATION_LAKE_NGVD29, ELEVATION_LAKE_NAVD88, ELEVATION_NAVD88);
     }
 
     private Parameter() {