Black Branch 2

Small headwater stream in agricultural setting. Minimal riparian buffer on right bank compromises habitat and water quality functions. Channel appears incised with limited floodplain connectivity. Limestone substrate is characteristic of Middle Tennessee geology.

Channel appears to be in a natural form but shows moderate incision. No direct channelization or structural modifications are visible. However, the steep banks and incised condition suggest the channel has adjusted to altered hydrology from surrounding agricultural land use. Some downcutting evidence is present with exposed rock substrate and steep bank angles.

Channel is moderately incised with banks 3-6 feet high relative to a very narrow channel. The stream appears disconnected from its floodplain. Agricultural land use likely contributes to flashy hydrology with altered runoff patterns. The mowed lawn on the right bank extends to the channel edge, removing natural buffer and increasing runoff velocity.

Limited sediment deposition observed. The channel bed is dominated by exposed limestone/gravel substrate suggesting the stream is transport-limited rather than deposition-dominated. Low flow conditions may mask some deposition. The rocky substrate appears relatively clean.

Under current low-flow conditions, the stream is dominated by shallow flow regimes. Only slow-shallow and fast-shallow regimes appear to be present. The narrow channel and shallow depth preclude deep flow conditions. Limited pool development means slow-deep and fast-deep regimes are largely absent.

Water is present but fills only a small portion of the channel width. Extensive exposed substrate is visible in both the front and back views. The trickle of water occupies perhaps 25-50% of the channel bottom at best, with much of the bed exposed. This is consistent with low-flow or intermittent conditions.

Some riffle features are visible over the exposed limestone substrate, particularly in the upstream view. The rocky substrate naturally creates some variation in flow, but the very low water level limits the functionality of these features. Riffle spacing appears moderate for this small channel.

This small headwater stream exhibits characteristics of an incised gully channel (Rosgen G type) with steep banks, entrenched form, and limited floodplain access. The limestone substrate provides some grade control but the channel appears to have adjusted to altered hydrology from surrounding agricultural land use. The narrow channel with steep banks and low sinuosity is consistent with an adjusting or degraded form. Some features also consistent with a Rosgen F type (entrenched meandering) but the high gradient and small size favor G classification.

Left bank has a narrow but present riparian corridor of cedar trees providing some root stabilization. Bank height is moderate (3-6ft) with steep angles. Some erosion and bare soil visible but tree roots provide partial protection. The narrow buffer of cedar and vine growth provides better protection than the right bank. Vine growth in understory helps stabilize soil.

Left bank has approximately 50-70% vegetative cover. Cedar trees and vine growth provide cover, but bare soil patches are visible. Some invasive vine species appear present in the understory. The narrow width of the vegetated corridor limits overall protection. During winter/dormant season, herbaceous cover is reduced.

Left bank has a narrow riparian corridor dominated by eastern red cedar with invasive vine growth. Agricultural pasture begins immediately beyond the tree line. The narrow buffer provides partial bank stabilization but is insufficient for full protection. Bank height is moderate with steep angles.

Right bank has very minimal riparian protection. Mowed lawn extends nearly to the channel edge with only scattered trees and a thin strip of unmowed vegetation. Bank stability is compromised by the lack of root reinforcement. While the right bank appears lower than the left, the absence of woody vegetation reduces resistance to erosion.

Right bank has less than 50% natural vegetation cover. Mowed grass dominates to within a few feet of the channel. The grass provides some surface erosion protection but lacks the deep root structure of woody vegetation needed for bank stability. The mowing regime removes natural regeneration. Very few trees provide canopy or root protection on this side.

Right bank is severely lacking in riparian vegetation. Mowed lawn extends to the channel edge with minimal woody buffer. This represents a significant riparian buffer deficiency. The bank is vulnerable to erosion during high flow events. Residential/agricultural structures are within close proximity.

Left riparian buffer is very narrow, estimated at approximately 10-25 feet wide. This consists primarily of a single row of eastern red cedar trees with vine understory. Beyond this narrow strip, open agricultural pasture begins. For a 3-4 foot wide channel, this represents approximately 3-6x the channel width, but in absolute terms it is very narrow and the filtering function is compromised by the sparse nature of the vegetation.

Right riparian buffer is essentially absent. Mowed lawn extends to within a few feet of the channel edge. Only scattered individual trees provide any woody vegetation. The filtering and bank stabilization functions are severely compromised. This is the most significant deficiency at this assessment location.

Floodplain vegetation is in a marginal state. The left bank has a narrow strip of trees and shrubs but no floodplain forest. The right bank has mowed lawn to the channel edge. The vegetation is not in a natural state on either side - the left side has been reduced to a thin tree line and the right side is maintained as lawn. Natural riparian/floodplain forest is absent.

Canopy cover is estimated at 25-50% overall, primarily from the cedar trees on the left bank. During winter with bare deciduous trees, shade is reduced. The right bank contributes very little canopy. For a warmwater stream, this provides some shading but is asymmetric and incomplete.

Both banks fail to meet TDEC minimum 30-foot riparian buffer requirements. The right bank is most critically deficient with mowed lawn to the channel edge. The left bank has a narrow but present tree line that could be expanded. Buffer restoration on both sides would significantly improve stream health and MS4 compliance. High restoration potential exists given the agricultural/rural land use context.

Limited favorable epifaunal substrate. The limestone/gravel bed provides some cobble habitat but the very low water levels limit the wetted area available for colonization. Very few snags, logs, or other complex habitat features observed. Minimal undercut banks. The low flow conditions and narrow channel severely limit the available habitat. Approximately 20-40% of substrate appears favorable.

Moderate embeddedness observed. The limestone substrate is partially surrounded by fine sediment and mud, estimated at 25-50%. Some areas show clean rock surfaces while others are covered with fine material. The low flow conditions allow sediment to settle and embed substrate. Agricultural runoff likely contributes fine sediment.

Pools are essentially absent at this location. The channel is uniformly shallow with the entire bed visible. Any pools that may exist during higher flows are not holding significant water under current conditions. The small channel size and low gradient limit pool formation.

Only 2-3 fish cover types are available. Overhanging cedar vegetation provides some cover, and limited root exposure is present. Some riffle habitat exists over the rocky substrate. However, deep pools, large woody debris, undercut banks, boulders, and macrophyte beds are absent or very limited. The stream is likely too small to support significant fish populations.

No physical barriers to fish movement visible in the immediate reach. However, the very low flow conditions may seasonally inhibit fish movement through this reach. The intermittent nature of the stream itself represents a functional barrier during dry periods.

Large woody debris is rare to absent in the channel. The narrow riparian corridor provides limited source material. No debris jams observed. Only small woody fragments visible in and near the channel. The lack of LWD significantly limits habitat complexity and pool formation potential.

Only 1-2 types of invertebrate habitat are present. Some coarse gravel/cobble substrate exists and leaf packs may accumulate in the channel. However, the very low water levels, lack of large woody debris, and absence of diverse substrate types severely limit invertebrate habitat. The intermittent nature of the stream further restricts colonization potential.

Score reflects habitat-based assessment only. The limited water, poor habitat diversity, and intermittent conditions suggest a community dominated by tolerant groups if present. No organisms could be directly identified from the panoramic imagery.

No macroinvertebrates directly observed in imagery. Assessment is based on habitat conditions only. The very low water levels and intermittent nature of the stream suggest a reduced community dominated by tolerant taxa. Habitat conditions are marginal for most aquatic invertebrates.

Suitable Habitat: No

Limited wildlife habitat value at this location due to narrow riparian corridor, intermittent water, and agricultural disturbance. The cedar trees provide some avian habitat. The stream is too small and intermittent to support significant aquatic species populations.

No wildlife directly observed during survey. The narrow riparian corridor and intermittent stream provide limited habitat. Eastern red cedar trees offer some nesting and cover habitat for birds. The agricultural landscape limits wildlife connectivity.

Water appears slightly turbid with a brownish tint but the bed is visible through the shallow water. No oil sheen, algal mats, or scum observed. The brown coloration may be from contact with soil and leaf tannins. Overall clarity is fair to moderate given the shallow conditions and natural substrate color.

No significant algae growth or macrophyte density observed. The water does not appear green or enriched. The bare winter conditions limit assessment, but no excessive nutrient indicators are apparent. Some minor biofilm may be present on rocks. Agricultural proximity suggests potential nutrient inputs but no visible enrichment symptoms.

No direct evidence of manure or waste observed in the stream. No livestock visible in adjacent fields. The agricultural land appears to be pasture/hay without active grazing at the channel. No waste pipes or discharge points visible. However, the close proximity of agricultural operations means some potential for non-point source contamination exists.

Asymmetric shading pattern with cedar trees on left bank providing the primary shade source. Right bank receives full sun exposure due to mowed lawn. The intermittent, shallow nature of the stream makes it vulnerable to thermal stress during summer months. Restoring riparian buffer on the right bank would significantly improve thermal conditions.

No active permit violations observed. The primary concern is the chronic lack of riparian buffer, particularly on the right bank. This is a land management issue rather than a permit violation but should be addressed through outreach and conservation programs.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

Some vine growth visible in the left bank riparian corridor that appears consistent with Japanese honeysuckle (semi-evergreen vine visible in winter). Some evergreen shrub growth on the left bank may include privet. Identification confidence is medium due to winter dormancy and image resolution. Eastern red cedar (Juniperus virginiana) is native and not invasive. The limited invasive presence is a secondary concern compared to the absence of riparian buffer.