Black Branch 2

Small perennial stream flowing through agricultural landscape. Evidence of habitat degradation from narrow riparian buffer and bank erosion. Sediment issues apparent from turbid water and fine sediment deposition. Stream likely supports warmwater fish and aquatic life community but is stressed by agricultural land use impacts.

Channel appears natural with no engineered modifications visible, but shows evidence of active incision and lateral erosion. The channel is somewhat entrenched relative to the adjacent floodplain, with moderate to steep banks. Root exposure on banks suggests ongoing downcutting. No artificial structures but the channel is responding to altered hydrology from surrounding agricultural land use.

Channel shows moderate incision with banks 3-6 feet high relative to the bed. The stream appears disconnected from its floodplain, meaning only larger flood events access the floodplain. Agricultural drainage from surrounding fields likely increases flashiness and contributes to incision. Low flow conditions at the time of assessment further suggest altered hydrology.

Moderate sediment deposition is evident. The downstream pool has brown/turbid water suggesting fine sediment inputs. Some aggradation is apparent from the exposed channel bed at the camera position, though the limestone substrate provides some resistance. Agricultural runoff is a likely sediment source. Approximately 20-30% of visible channel bottom appears affected by fine sediment deposition.

Three velocity/depth regimes are apparent: the downstream pool provides slow-deep habitat, the exposed rocky bed area provides fast-shallow (when flowing), and transitional areas provide slow-shallow conditions. Fast-deep regime is not evident in the visible reach, likely due to the narrow channel and low flow conditions.

Water fills approximately 50-75% of the channel at the time of assessment. The camera position shows extensively exposed substrate with only thin water film, while downstream a pool retains more water. Exposed substrate is common across the visible reach. Flow is present but low.

Riffle-pool sequences appear present but are somewhat infrequent for a stream of this size. The exposed rocky bed at the camera position functions as a riffle area, with a pool visible downstream. Spacing appears moderate, roughly 7-15 channel widths between riffles. The low gradient limits riffle development.

This stream exhibits characteristics of a Rosgen F-type channel: entrenched, meandering with riffle-pool morphology, and high bank erosion potential. The channel has incised into the floodplain, disconnecting from its former floodplain surface. The limestone/gravel bed provides some resistance to further downcutting, but lateral erosion is evident. The agricultural land use has likely increased runoff flashiness, contributing to the incision. This F-type classification suggests the channel is in an unstable state transitioning from a former C or E type through incision.

Left bank (looking downstream) shows moderate instability with steep banks approximately 3-6 feet high. Some root protection is present from riparian trees, but root exposure is moderate to severe in places, indicating ongoing erosion. The bank is actively eroding through undercutting. Agricultural field abuts within a very narrow buffer, limiting long-term stability. Trees on the bank edge may be at risk of toppling.

Vegetative coverage on the left bank is approximately 50-70%. The bare winter condition reduces the visible protective function, but the sparse tree and shrub coverage even in leaf-on conditions would provide only moderate protection. Bare soil is visible in patches, and the narrow buffer width limits the ability of vegetation to protect the bank from agricultural runoff and floodwater impacts.

Left bank shows moderate erosion with active undercutting. Riparian buffer is narrow with agriculture immediately adjacent. Root exposure indicates ongoing lateral migration. Bank would benefit from buffer expansion and stabilization.

Right bank (looking downstream) appears slightly more stable than the left, with a steeper wooded slope providing somewhat better root protection. A fallen tree and natural woody debris provide some bank armor. However, the bank is still moderately high (3-6 ft) and steep with bare soil visible. The slightly higher bank and denser tree coverage provide marginally better stability.

Right bank vegetative coverage is approximately 60-75%. The tree density is somewhat higher on this bank with multiple stems providing root protection. Winter bare conditions reduce apparent coverage but the woody stem density suggests moderate protection in the growing season. Some leaf litter ground cover is present. The buffer appears slightly wider on this side though still narrow.

Right bank is slightly more stable than left with denser woody vegetation. Some fallen trees contribute natural bank armoring. Agricultural field visible beyond the riparian strip but buffer appears marginally wider on this side. Moderate erosion on outside of bends.

Left riparian buffer is extremely narrow, estimated at less than 10 feet in most areas. For a channel approximately 8-10 feet wide, this represents roughly 0.5x or less of channel width. Agricultural pasture extends nearly to the bank edge, severely compromising filtering function and providing minimal buffer for runoff, sediment, and nutrient control.

Right riparian buffer is slightly wider than the left, estimated at 10-25 feet based on visible tree coverage before open fields begin. This represents approximately 1x channel width but still falls short of desirable buffer width. The filtering function is partially compromised.

The floodplain on both sides is dominated by agricultural pasture/hay field with most native woody vegetation removed. Only a very narrow strip of trees and shrubs remains along the immediate channel banks. The vegetation is not in a natural state as agricultural use has dramatically reduced the riparian forest that would be expected for this stream type.

Currently in winter bare-tree condition, canopy shade is very low, well under 25%. Even during full leaf-on conditions, the narrow riparian strip and sparse tree coverage would only provide approximately 30-50% shade over the channel. The combination of narrow buffer width and seasonal leaf loss results in low overall shade.

Significant buffer deficiency on both banks. Agricultural use extends to near the bank edge, particularly on the left bank. High potential for buffer restoration through agricultural set-aside or riparian planting programs. This is a priority area for buffer establishment to reduce sediment and nutrient loading from agricultural fields.

Approximately 40-50% of substrate provides favorable habitat for epifaunal colonization. Fallen logs, undercut banks, exposed root systems, and cobble/gravel provide habitat. However, fine sediment deposition and the relatively uniform low-flow conditions reduce overall habitat quality. The woody debris in the channel is beneficial but not abundant enough to be scored higher.

Where gravel and cobble substrate is visible (particularly in the down-facing view), approximately 25-50% appears surrounded by fine sediment. The brown water color suggests ongoing fine sediment transport. The limestone/gravel substrate at the camera position shows moderate embeddedness with silt and fine material filling interstitial spaces. Agricultural runoff is the likely sediment source.

One pool is visible downstream but appears shallow, likely under 2 feet deep. The bottom is partially obscured by turbidity rather than depth. Pools appear present but infrequent and shallow for a stream of this size. The low flow conditions may exaggerate pool scarcity, but overall pool habitat is limited.

Five cover types are present: logs/woody debris (fallen trees in channel), overhanging vegetation (bare branches but some shrubs), undercut banks (visible on both banks), root mats (exposed root systems), and riffle habitat (exposed rocky substrate). Deep pools, boulders, and macrophyte beds are absent or minimal.

No barriers to fish movement are visible in this reach. However, the low flow conditions could seasonally limit fish passage through very shallow riffle areas. No culverts, dams, or artificial barriers are visible. Score reduced slightly from 10 due to low flow conditions that may seasonally inhibit movement.

LWD is present but sparse, estimated at 3-7 pieces per 100m. One or two larger pieces span the channel downstream, and a fallen tree visible in the right bank view contributes. A mix of size classes is present from small branches to large trunks. The fallen tree downstream appears to be creating a small pool behind it. Decay ranges from fresh to moderately decayed.

Five habitat types are present for macroinvertebrate colonization: fine woody debris (small branches), submerged logs (fallen tree in pool), leaf packs (winter leaf accumulation), undercut banks, and cobble/gravel substrate. However, fine sediment deposition reduces the quality of some of these habitats, particularly the cobble interstitial spaces. The woody debris appears partially colonizable with some moderate decay.

Score of 6 assigned based on habitat potential rather than direct observation. The stream habitat with cobble, woody debris, and undercut banks would support facultative taxa. Moderate sediment deposition and agricultural runoff impacts would likely suppress intolerant taxa while supporting tolerant to facultative communities.

No actual macroinvertebrates are directly visible in the imagery. Score based on habitat assessment suggesting the stream would support a moderate Group II community given the mixed substrate, presence of woody debris, and marginal water quality. Winter conditions reduce observable activity.

Suitable Habitat: No

Stream habitat is too degraded for most species of concern. The narrow buffer, agricultural impact, and moderate water quality limit the potential for rare or sensitive species. However, the limestone substrate and perennial flow provide some basic habitat that could support common warmwater fish and invertebrate species.

No wildlife directly observed in the imagery. Winter conditions reduce wildlife activity and visibility. The standing dead trees (snags) and fallen tree debris piles provide some wildlife habitat features. The stream corridor, while narrow, serves as a linear wildlife corridor through the agricultural landscape.

Water has a brown/tan color with slight turbidity. In the downstream pool, clarity appears to be 1-2 feet with some objects partially visible through the water. No oil sheen, foam, or algal mats are observed. The brown color is consistent with suspended fine sediment typical of streams draining agricultural land in the region. During dry weather base flow, this turbidity level suggests ongoing fine sediment inputs.

No obvious nutrient enrichment indicators such as excessive algae, dense macrophytes, or green water color. The brown water color appears related to sediment rather than algae. Some minor algal growth may be present on rocks but is not conspicuous. Winter conditions reduce algal growth potential. However, proximity to agricultural fields suggests nutrient loading potential exists.

No direct evidence of manure, waste, or livestock access to the stream is visible in this scene. The adjacent fields appear to be pasture or hay fields without current livestock presence visible. No manure on banks or in the stream. However, the pasture land use suggests potential for livestock access in other locations along the reach. Score slightly reduced from 10 due to agricultural land use context.

This is a warmwater stream in an agricultural setting. Current shade is minimal due to winter bare conditions and narrow riparian buffer. During summer, the narrow buffer would provide only limited shade, likely under 50% even in full leaf condition. The open agricultural fields on both sides allow solar heating. Riparian buffer expansion would be the most effective thermal management strategy. No impervious surface thermal loading is apparent in this rural setting.

No apparent permit violations or active disturbance observed. The primary concern is the inadequate riparian buffer width, which is a long-term condition rather than a recent disturbance. Agricultural practices should maintain a wider setback from the stream.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

Confidence is low due to winter bare conditions making species identification difficult. Some shrubby growth patterns in the riparian zone are suggestive of multiflora rose and bush honeysuckle based on branching architecture and growth habit, but positive identification requires growing-season verification. Some vine-like growth on trees could be Japanese honeysuckle. Overall invasive presence appears scattered rather than dominant. A growing-season survey is recommended for definitive invasive species inventory.