1. Add a basemap that specifies countries.
2. Zoom in on the streams layer. 
3. Now zoom out until you can see country boundaries.
4. In which country is the streams layer situated?

What is the current coordinate system?

Now compute the length of the stream in kilometre:

1. Add a double precision field named Stream_KM to the Streams layer and compute geometry for line length in kilometers.
2. How many stream segments are shorter than 1 kilometer? 

Compute the total number of salmon per stream using the following steps:

1. Add an integer field named Total to your Salmon_Table. Compute the total number of salmon in each 50m section.
2. For each ID determine the total number of salmon using the Summary Statistics geoprocessing tool (from the attribute table).
3. What is the total number of salmon in Big Creek? 

To compute the maximum number of sockeyes, kings, and silvers per 50-meter sample, for each stream, use the Summary Statistics tool on the Salmon_Table, specify a Case field of ID and use the Maximum statistic. Which stream has the maximum number of silvers?

Use the Create Routes geoprocessing tool to create a measured line for each stream, based on the stream ID, with the measures starting in the lower left. Transfer all the attributes from your original streams line theme to your measured routes layer using the Join Field geoprocessing tool.

How can you tell from the shape property whether a line theme contains measures? 

Explore the streams layer. Note that each stream identified by STREAM_NAM has a unique STREAMS_ID, which matches the ID field found in the Salmon_Table. Which stream represents the median length? 

To determine the density (number of salmon per stream KM), join the total salmon counts to your Streams layer (TARGET) attribute table. Add a field for salmon density and compute the density of salmon per km of stream. Which stream has the lowest density of salmon? 

Which state will you find the study area in?

Symbolize your Streams layer to show line direction (Symbology>Format Line Symbol). The direction of Streams lines is important as each line represents the from- and to- directions in the line theme, which should match the sampling saved in the Salmon_Table. Remove all joins from the Streams layer. Select the stream section not flowing north and run the Flip Line tool so all Stream section go upstream. Clear selection. 

Which stream section was not flowing north (upstream)? specify the Streams_ID.