Black Branch 2

Small headwater stream in agricultural landscape. Narrow riparian buffer on left bank with direct agricultural adjacency suggests potential for nutrient and sediment loading. Bedrock substrate limits some habitat types. Low flow conditions may reflect seasonal baseflow or potential hydrologic alteration from surrounding land use.

Channel appears relatively natural with no direct structural alteration. However, the channel shows evidence of incision with moderate bank heights relative to the small channel width, suggesting some downcutting likely related to changes in watershed hydrology from agricultural land use. The bedrock substrate is controlling further incision.

The channel shows moderate incision with banks 3-6 feet high relative to the narrow channel width. The adjacent agricultural fields appear to be above the current channel elevation with limited floodplain connection. Agricultural land use in the watershed likely increases flashiness while the incised channel limits floodplain access.

The bedrock-dominated substrate shows minimal sediment deposition. The channel is largely self-cleaning with bedrock controlling the bed. Some fine sediment and broken rock fragments are present along margins but do not constitute significant deposition. The bedrock substrate resists aggradation.

At current low flow, the stream is dominated by shallow conditions — both slow-shallow runs over flat bedrock and fast-shallow riffles over broken rock. No deep pools are visible. The bedrock substrate and low flow conditions limit depth variability. Only 2 of 4 regimes present.

Water fills only a portion of the channel width with extensive exposed bedrock substrate visible on both sides and in the channel bed. The flow is very shallow, barely covering the bedrock in places. Approximately 25-50% of the channel bottom is wetted at current conditions.

Some riffle features are visible where water flows over broken bedrock, but the channel is dominated by relatively flat bedrock runs. The gradient appears moderate enough for periodic riffles, but at current low flow the distinction between riffles and runs is minimal. Moderate riffle frequency estimated.

This small headwater stream has characteristics of an entrenched channel cut into limestone bedrock. The narrow width, moderate bank heights, and bedrock control suggest a Rosgen G or possibly B type, though the very small scale makes classification uncertain. The bedrock substrate limits further downcutting but the channel appears disconnected from its historic floodplain, likely due to incision associated with agricultural land use changes. Low confidence in Rosgen type due to very small channel size and difficulty assessing width-depth and entrenchment ratios from imagery alone.

Left bank (adjacent to agricultural field) has moderate height (3-6 ft), steep angle, and very sparse root protection to the baseflow elevation. The narrow riparian buffer provides limited root stabilization. The bank shows evidence of scour and some slumping. Agricultural field extends nearly to the bank edge, limiting recovery potential without intervention.

Left bank has sparse vegetation coverage, approximately 50-70%. The riparian buffer is extremely narrow before transitioning to open pasture. Some bare soil is visible on the bank face. Winter dormancy makes exact assessment challenging but the thin riparian strip provides compromised protection.

Left bank is the most vulnerable bank at this location. The extremely narrow riparian buffer between the channel and agricultural field provides inadequate protection. TDEC minimum buffer requirements are likely not met on this side.

Right bank has denser shrub and tree vegetation extending from the bank edge, providing better root stabilization than the left bank. The bank height is moderate but the denser vegetation helps bind the soil. Natural rock at the bank toe provides some additional stability. Minor erosion is present but the bank appears more stable than the left.

Right bank has moderate to good vegetation density (approximately 70-80%) with dense shrub thicket and trees providing bank coverage. Some bare soil visible but overall better protected than left bank. Winter dormancy limits full assessment but the density of woody stems suggests good growing season coverage.

Right bank in better condition than left, with denser riparian vegetation and natural rock providing toe protection.

Left riparian buffer is extremely narrow, estimated at less than 10 feet before transitioning to open agricultural pasture. For a channel approximately 4-5 feet wide, this represents less than 2x channel width but the absolute width is critically deficient for filtering and buffering function. The buffer consists of scattered trees and sparse shrub cover with minimal filtering capacity.

Right riparian buffer appears wider than left, estimated at 25-50 feet of dense shrub and tree cover. This provides more adequate filtering function though the width may still be marginal for full ecological benefit. The dense woody vegetation provides better structure than the left bank.

The left floodplain is converted to agricultural pasture with virtually no natural floodplain vegetation remaining. The right side retains some woody vegetation but the overall floodplain vegetation condition is marginal with most of the natural riparian forest removed for agriculture.

During leaf-on season, the right bank trees and the scattered left bank trees would provide approximately 25-50% shade coverage over this narrow channel. The winter bare condition shows good canopy framework on the right but very limited coverage from the left. The narrow channel width means even sparse canopy can provide some shade.

The left bank agricultural encroachment within the required buffer zone is a significant compliance concern. The open pasture extends nearly to the channel edge. Buffer restoration on the left bank by establishing native woody vegetation would significantly improve stream function and comply with TDEC MS4 permit section 4.2.5.4 requirements. The right bank buffer, while better, should also be assessed for adequacy.

The bedrock-dominated substrate provides limited epifaunal colonization habitat. While some cobble-sized broken rock is present along margins, the flat bedrock lacks the interstitial spaces and texture needed for diverse colonization. Some undercut areas along banks provide limited habitat. Overall approximately 20-40% of substrate is favorable.

Where cobble and broken rock are present, they show moderate fine sediment filling (approximately 25-50%). The bedrock substrate itself is not embedded but the loose rock along margins has some fine sediment accumulation. Overall embeddedness is moderate.

No pools are visible at this location. The flat bedrock substrate and low flow conditions result in very shallow, uniform depth across the channel. The entire bottom is readily discernible. This is a significant limiting factor for fish and aquatic habitat.

Limited fish cover types present: some overhanging vegetation from bank shrubs, minor undercut banks, and scattered cobble/boulder. Absent are deep pools, logs/woody debris in channel, macrophyte beds, and backwater areas. Only 3 cover types available.

No barriers visible at this location. However, the very low flow conditions during baseflow may seasonally limit fish passage through this shallow bedrock reach. Score reflects potential seasonal limitation.

Very little large woody debris is visible in or adjacent to the channel. Only small branches and twigs are present. No debris jams or pool-forming wood. The narrow riparian corridor, particularly on the left bank, limits the supply of LWD to the stream. This is a significant habitat deficiency.

Only 2 invertebrate habitat types readily identified: cobble/broken rock along channel margins and minor undercut bank areas. The flat bedrock substrate provides limited interstitial space. No leaf packs, submerged logs, or fine woody debris accumulations are visible. The low habitat diversity is a limiting factor for macroinvertebrate communities.

Score of 6 assigned as default for habitat that could support facultative organisms. The clear water and natural bedrock substrate suggest moderate water quality, but limited habitat diversity likely limits macroinvertebrate diversity. Field sampling recommended.

No macroinvertebrates directly observed from imagery. Score based on habitat assessment only — the bedrock/cobble substrate with clear water could support Group II organisms. Actual macroinvertebrate sampling would be needed for accurate assessment.

Suitable Habitat: No

The small, shallow, bedrock-dominated channel with limited habitat diversity is unlikely to support species of concern. The agricultural adjacency and narrow buffer further reduce habitat quality.

No wildlife directly observed. Winter season and small stream size limit observations. The dense shrub thicket on the right bank provides some cover habitat. The bedrock substrate is too uniform for most aquatic species of concern.

Water appears clear in the DOWN face view, with the bedrock substrate easily visible beneath the shallow flow. No sheen, film, or discoloration is evident. Water depth is so shallow that clarity is easily assessed. Under current dry weather conditions, water quality appears good. Score reduced slightly from 10 because the agricultural adjacency suggests periodic turbidity during storm events.

Water is clear with no visible algal mats or excessive growth. Some minor biofilm/algae may be present on bedrock surfaces (dark coloration on rock in DOWN face) but no problematic growth. No macrophytes visible. Adjacent agricultural land could contribute nutrients but current conditions show minimal enrichment indicators.

No direct evidence of manure or livestock waste in the stream. However, the adjacent agricultural field appears to be pasture land and a red barn is visible in the distance, suggesting livestock operations in the area. No direct livestock access to the stream is visible at this point, but the narrow buffer on the left side provides limited protection. Score reflects potential concern from nearby agricultural operations.

This is a small warmwater stream with patchy shade from the narrow riparian corridor. During summer months, the shallow water depth and limited canopy coverage (especially from the left bank open field) will result in significant solar heating. The narrow channel width helps limit total solar exposure. Riparian buffer enhancement on the left bank would improve shade conditions.

While no recent disturbance is detected, the existing condition of the severely deficient riparian buffer on the left bank raises compliance concerns regarding TDEC buffer requirements. The agricultural encroachment to within feet of the channel edge is a chronic condition that warrants attention.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

Winter dormancy severely limits invasive species identification. The dense shrub thicket on the right bank and scattered green vine growth visible in the front and left views suggest possible multiflora rose, bush honeysuckle, and Japanese honeysuckle presence — all common in Middle Tennessee riparian areas. These identifications are low confidence and should be verified during growing season. The green vining plant visible at bank edges in several views could be Japanese honeysuckle (semi-evergreen in mild Tennessee winters).