Community Science Data

OCCA is a science-driven organization.

Learn more about some of the scientific data that OCCA staff and volunteers collect. Our organization prides itself on making our data open to the public, so it can be used by the public, institutions, municipalities, or governmental organizations to further scientific research or local change.

Hours Spent in 2025...

Find Our Data

Stream Monitoring — CMC Database

Culvert Assessments — NAACC Database

Invasive Surveys — iMapInvasives

Invasive Species Data

Invasives Found & Reported by OCCA, 2019-2025

Hemlock Woolly Adelgid

Culvert Assessment Data

Aquatic Organism Passage (AOP) Rating

Note: "No Score" happens when there is missing data. This can be the result of in accessible culverts (buried, generally inaccessible) or when there is no flow of water due to structural or weather conditions.

“Fencing” can create significant barriers to organism passage

AOP Rating: Culverts Assessed in 2025

This graph represents the combined total of culverts assessed throughout the three watersheds. ~23% of all assessed culverts have no score. ~10% have full AOP. ~29% have reduced AOP. ~38% have no AOP.

Types of Barriers Found

Crossing Type

Crossing Condition

Barrier Severity

Stream Monitoring Data

View our 2025 Data Packet
note: sites added in 2025 are not included