Here is how to use Transparentgov's map viewer to view ESRI's Arcgis REST api endpoint
Alternatively, you can use ESRI's map viewer, ESRI's classic map viewer, ESRI's web app viewer as well, click here
https://transparentgov.net/cleargov1/1740/how-to-open-esris-map-use-esris-map-viewer
3 panel system
https://transparentgov.net/json2tree/esri/server/folder.html
2 panel system
https://transparentgov.net/json2tree/esri/server2/folder.html
Advanced Layer
https://transparentgov.net/json2tree/esri/server2/searchLayer.html
Simple Layer
https://transparentgov.net/json2tree/esri/server/searchLayer.html
Advanced MapServer
https://transparentgov.net/json2tree/esri/server2/searchMapServer.html
Simple MapServer
https://transparentgov.net/json2tree/esri/server/searchMapServer.html
How to use
https://transparentgov.net/cleargov1/1149/how-to-explore-arcgis-rest-api-endpoint-army-corps-engineers
https://transparentgov.net/cleargov1/1629/how-use-free-transparentgov-tool-see-through-any-government