Can you explain what projection your data has?
They were drawn in the Projected Coordinate System: NAD 1983 UTM Zone 15N, Projection: Transverse Mercator, WKID: 26915; with Geographic Coordinate System: GCS North American 1983, WKID: 4269.
What is that number?
The number on the labels is 1076+61. This appears to be the total length of the line when converted into feet and further converted into a method of stationing that is used for roadways and levees.
Your original VB script used esri__measure. Is that value (attribute) available in the data in the web map?
The esri__measure is the Shape Length of the lines drawn. The data is located in the map, though not currently a web map.
I guess you have points and want to show the measurement based on that value, right? And the value is in meters and you need to translate that to feet?
I am using existing data that is centerlines for levees. We collected observations that use the measurement along this line as a reference for points and lines along the centerline.