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<div class="section level2">
<h2 id="introduction">Introduction<a class="anchor" aria-label="anchor" href="#introduction"></a>
</h2>
<p><code>nhdplusTools</code> offers a few indexing functions and some
supporting functions that are worth being aware of. Most of these
functions wrap similar but more general functions from <a href="https://doi-usgs.github.io/hydroloom/reference/index.html#indexing-and-linear-referencing" class="external-link"><code>hydroloom</code></a>.</p>
<p>The core